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C is the correct answer as correct preposition is "Unions to".
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mykrasovski
Interestingly, forbid to do smth and forbids someone from doing smth are both correction versions of the idiom according to Merriam-Webster (https://www.merriam-webster.com/dictionary/forbid) and Oxfordlearning (https://www.oxfordlearnersdictionaries. ... ish/forbid).

Would any of the forum experts provide help in solving this problem? Thank you in advance.

MikeScarn, GMATNinja, GMATNinjaTwo, hazelnut, generis
Hi mykrasovski,

I think it comes down to the fact that some people feel that forbid... from is incorrect.

I would hope that a live official question would not put test takers in a position where they have to choose between forbid... to and forbid... from, unless the usage is clearly incorrect (like forbid from engage in).
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AjiteshArun I guess "hope" is the best thing we can do :)

Otherwise, perhaps GMAT prefers one to another? I recall there is a post by GMATNinja in which he says that GMAT prefers "aid/help in doing smth" to "aid/help to do smth". Thoughts?
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The National Labor Relations Act expressly forbids unions from engaging in secondary boycotts against companies not directly involved in a labor dispute.

(A) unions from engaging in
(B) the engagement by unions of
(C) unions to engage in
(D) unions from becoming engaged with
(E) that unions engage upon

This is an age-old debatable question. Although dictionaries accept the idiom 'forbid someone from doing something', GMAT seems to accept only the infinitive form 'to forbid'. Therefore, as per the ethos of GMAT, choice C will be the correct answer. A can be avoided in the GMAT.
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AjiteshArun I guess "hope" is the best thing we can do :)

Otherwise, perhaps GMAT prefers one to another? I recall there is a post by GMATNinja in which he says that GMAT prefers "aid/help in doing smth" to "aid/help to do smth". Thoughts?
I'm with daagh on this one: if a live question forces us to take this call, forbid... to is the safer option. :)
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Hi daagh

I choose E since I felt that forbid comes under subjunctive mood. Please help me where did I go wrong herefdaa
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Is it said so that forbid is a subjunctive mood verb? You might be fancying. pl show some concrete cases in GMAT
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