We shall ask for samples ____ and then we can make our decision.A. to be sent B. being sent C. to sent D. to have been sent

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We shall ask for samples ____ and then we can make our decision.
A. to be sent B. being sent C. to sent D. to have been sent

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.

A. to be sent