题目内容
20．He ________ when the UFO arrived．He didn't wake until the UFO disappeared．（ ）| A． | slept | B． | was sleeping | ||
| C． | was doing homework |
分析 当UFO到来的时候他正在睡觉，直到UFO消失他都没有醒．
解答 答案：B．跳过空格推知句意结合 wake 可知表达的是当UFO到来的时候他正在睡觉，表达的是过去正在进行的动作，故用过去进行时was/were+doing，主语he，故was，故答案是B．
点评 过去进行时（Past continuous tense或Past Progressive tense）表示过去在某一时间段或某一段时间内正在发生或进行的动作或状态．
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