2. 外语
  3. I doubt whether he can ______ his efforts much longer as he looks very tired.

I doubt whether he can ______ his efforts much longer as he looks very tired.

admin2011-01-15  84
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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大学英语四级

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