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keep 后加什么?ascertain

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keep 后加什么?
ascertain
keep 后加什么?ascertain
1.keep + 形容词,使...保持在(某一状态
She kept the child quiet.她让孩子别作声.
2.keep + 动词ing Keep practicing,you will make progress.
3.keep sb/ sth.from doing sth.阻止,妨碍;控制住
Robbie couldn't keep the child from yelling.
罗比没法使孩子不大叫大嚷.
4.+ 名词 We keep food in a refrigerator.我们把食物存放在冰箱里.