it was essential that the form __back before the deadline.A.

it was essential that the form __back before the deadline.A.must be B.be sent C.would be sent Dwas sent.答案是B请帮我分析下为什么其他几个不可以呢.

zina纯 1年前已收到1个回答举报

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这个是被动语态,所以排除了A,
这个是一般过去式,所以排除了C
前面已经有一个was了,后面就只能接be的原形,所以排除D而选B.

1年前

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