题目内容
Your son has kept _________ for two hours. You’d better ask him to have a rest.
- A.study
- B.studied
- C.to study
- D.studying
D
keep doing 保持不间断地做某事 keep to do keep要求 -ing, 没有 to do 形式.故选D.
keep doing 保持不间断地做某事 keep to do keep要求 -ing, 没有 to do 形式.故选D.
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