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

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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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