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  3. I am not sure whether he can ______his efforts much longer as he looks very exhausted.

I am not sure whether he can ______his efforts much longer as he looks very exhausted.

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问题 I am not sure whether he can ______his efforts much longer as he looks very exhausted.
选项 A、keep up
B、keep on
C、keep up with
D、keep at
答案A
解析 A项keep up意为坚持，继续，符合句意。B项keep on意为继续进行，继续下去。常接动词一ing形式，如：We kept on working in the fields in spite of the rain．尽管下雨，我们还是坚持在地里劳动。不能说keep on one’s efforts。C项keep up with意为跟上。D项keep at意为坚持做，不停地做。不与efforts搭配使用。
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