-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:

  本題考查固定搭配的用法。I'm sure意思為:我確定;I'm not sure意思為:我不能確定; I'm net sure about意思為:我不能確定……,about后面跟賓語(yǔ),本句才完整;I make sure意思為:我確保。句意是:“你知道他將在深圳待多久嗎?”“對(duì)不起,我不知道;蛟S幾個(gè)星期,但是________(我不能確定)!眀ut表轉(zhuǎn)折,答案應(yīng)為“我不能確定”,即選B。


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