问题描述：
下面的题帮忙看下到底选择什么并且说明原因,有说选A的,有说选B的.
17.We shall ask for samples _____ and then we can make our decision.A.to be sent B.being sent C.to set D.to have been sent
17.We shall ask for samples _____ and then we can make our decision.A.to be sent B.being sent C.to set D.to have been sent
问题解答：
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