I doubt whether the young man can _________his efforts much longer as he looks v

游客2023-12-30  18

问题 I doubt whether the young man can _________his efforts much longer as he looks very tired.

选项 A、keep on
B、keep on with
C、keep up
D、keep up with

答案 C

解析 keep up(保持);keep on(继续做);keep up with(跟上,不落后)。
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