题目内容
【题目】The doctor suggested that he shouldn't __________ in bed for long.
A. keep on lying B. keep lying
C. keep to lie D. keep lie
【答案】B
【解析】考查动词keep的用法。句意:医生建议他不应该持续卧床太久。keep on doing sth.表示反复发生的动作;而此句中表示的是状态的延续,故用keep doing sth.
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