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LiveStronger
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this sentence is in subjunctive mood --- only C and E maintain the right usage ...

I pick E. "mercury levels of" sounds better
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IMO E, "the mercury levels of sounds" better than "the mercury levels be tested for"
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Good OE. I had rejected C thinking there is a wrong usage of preposition "for". Thanks livestronger for the post.
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command rule is applied here , so be tested
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A X "should" is not a command, wrong
B X "should" is not a command, wrong
C X "…for all lakes and streams"= "testing the mercury level in order to benefit lakes and streams" bad meaning
D X "should" is not a command, wrong
E CORRECT
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Question seen in MGMAT - Manhattan GMAT Test
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Question seen in MGMAT - Manhattan GMAT Test
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Thank you! Added the tag.
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I don't get why "be" is used here. The subjunctive rule in short is for : prrr is mad : propose, recommend,require,resist, insist,suggest,mandate,ask,demand.
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s3fushah
I don't get why "be" is used here. The subjunctive rule in short is for : prrr is mad : propose, recommend,require,resist, insist,suggest,mandate,ask,demand.

Hello s3fushah,

We hope this finds you well.

To clear up your doubt, the command subjunctive can be used with any verb that conveys a demand or request, in this case, the verb "ordered".

We hope this helps.
All the best!
Experts' Global Team
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