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

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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
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

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
A
应该表被动.而being +过去分词(强调事情正在发生),having + been + 过去分词(强调事情已经发生),to be done 表示将要发生的动作,通常在句子中作状语

毫无疑问选A
没有B这种说法

选A吧,被动