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

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
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

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