We shall ask for samples ____ and then we can make our decision.
A. to be sentB. being sentC. to sent D. to have been sent
人气:423 ℃ 时间:2019-10-19 12:37:05
解答
A.to be sent 标本是要被送来的,所以要用不定式(表将来)的被动语态.
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