Although Napoleon's army entered Russia with far more supplies than they had in their previous campaigns, it had provisions for only twenty-four days.
they无所指
it had provisions for only twenty-four days it 指代 army, 在GMAT中army, citrus这种集合名词作为单数理解。 ABCD都用了they, their等,没有对应,所以都错!
If than is followed by a clause referring to army, the subject of that clause must be singular (it).
in错误
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