题目内容
While the alien ________ the museum, the boy called the TV station.
A.visiting | B.was visiting | C.visited | D.visit |
B
解析试题分析:句意:当外星人在参观博物馆时,那个男孩给电视台打了电话。while,当……,它引导的时间状语从句强调一个动作正在发生时,另一个动作发生了。故while后的从句经常用进行时,其结构是be + V-ing.故选B
考点:考查过去进行时态。
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