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职称英语
I doubt whether he can ______ his efforts much longer as he looks very tired.A、k
I doubt whether he can ______ his efforts much longer as he looks very tired.A、k
游客
2023-07-21
58
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问题
I doubt whether he can ______ his efforts much longer as he looks very tired.
选项
A、keep up
B、keep on
C、keep in
D、keep at
答案
A
解析
keep up“坚持,维持”;keep on“继续”;keep in“抑制”;keep at“坚持”。
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