______his address, I can’t send this book to him.

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问题 ______his address, I can’t send this book to him.

选项 A、Not knowing
B、Knowing
C、Not know
D、N6t known

答案A

解析 本句是动词 -ing形式放于句首作原因状语,句意是:因为不知道他的地址,我不能把这本书寄给他。所以需用否定式,在动词 -ing之前直接加not。
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