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为什么啊Weshallaskforsamplesandthenwecanmakeourdecision.A.tobesentB.beingsentC.tosentD.tohavebeensent

题目详情
为什么啊
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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答案和解析
固定词组 ask for doing