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Ifthey_______thecontractaheadoftime,theycouldnothavemissedtheplan.AsignedBhadsignedCwouldhavesignedDshouldsign选哪一个?
题目内容：
If they _______ the contract ahead of time,they could not have missed the plan.
A signed
B had signed
C would have signed
D should sign
选哪一个?优质解答
B 虚拟语气,根据后边一句说明这里是过去完成时虚拟语气的考察
A signed
B had signed
C would have signed
D should sign
选哪一个?
优质解答
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