【題目】Frank fell asleep ______ he was having an English class.

A. while B. before C. as soon as D. until

【答案】A

【解析】句意：當Frank正在上英語課的時候他睡著了。while當…時候，引導時間狀語從句；before在…之前；as soon as一…就…；until直到…時候。根據(jù)句意和從句中使用的時態(tài)可知應選A。while引導時間狀語從句時，從句中謂語動詞應該是持續(xù)性的，常用進行時態(tài)，主句用一般過去時態(tài)。

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