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-Do you know how long he is going to stay in Shenzhen?

-Sorry,I don't know.Maybe a few weeks,but ________.

[  ]

A.

I'm sure

B.

I'm not sure

C.

I'm not sure about

D.

I make sure

答案:B
解析:

  本题考查固定搭配的用法。I'm sure意思为:我确定;I'm not sure意思为:我不能确定; I'm net sure about意思为:我不能确定……,about后面跟宾语,本句才完整;I make sure意思为:我确保。句意是:“你知道他将在深圳待多久吗?”“对不起,我不知道。或许几个星期,但是________(我不能确定)。”but表转折,答案应为“我不能确定”,即选B。


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