While the alien ________ the museum, the boy called the TV station.
A．visitingB．was visitingC．visitedD．visit
B

試題分析：句意：當(dāng)外星人在參觀博物館時，那個男孩給電視臺打了電話。while,當(dāng)……，它引導(dǎo)的時間狀語從句強(qiáng)調(diào)一個動作正在發(fā)生時，另一個動作發(fā)生了。故while后的從句經(jīng)常用進(jìn)行時，其結(jié)構(gòu)是be + V-ing.故選B
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