当前位置:在线题库搜索>[单选题]The emergency required that all the tasks ____________ at least two days ahead of time.的答案是什么?

问题:

[单选题]The emergency required that all the tasks ____________ at least two days ahead of time.

A、to complete
B、should complete
C、be completed
D、should have been completed

参考答案: C

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