单选题
It was essential that he ______ the contract before the end of the week.
A、
sign
B、
would sign
C、
signed
D、
could sign
【正确答案】
A
【答案解析】
[分析] 此题考查主语从句中虚拟语气的用法。在“It is(was)+adj.(essential)+主语从句”句型中,从句谓语用“(should)+动词原形”。
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