Please read the whole sentence, and keep your eyes on phrase "has left workers without pay
". The main verb is singular, "has
", thus we need to find the main subject that must be singular
. Let see all options.Three factories were closed and one of them was owned
by Mr Deripaska, one of Russia’s richest tycoons and the boss of Rusal, the world’s largest aluminum company,
has left workers without pay.
Note: The highlight part is just the modifier.
A. Three factories
were closed and one of them was ownedWrong.
"three factories" is plural.
the three factories, all three were closed and one was ownedWrong.
"Of the three.." is not a subject.
C. The closure
of three factories, one of them ownedCorrect.
"The closure" is the main subject and is singular.
D. Three factories
were closed and ownership of one of themWrong.
Same as in A. "Three factories" is plural. In addition, "ownership of one of them" is very awkward.
E. The closure of three factories, one of it
"one of it" is definitely incorrect.
Hope it helps.
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