【題目】_______ he was sleeping, Sam knocked at the door.
A.While
B.During
C.As
D.If

【答案】A
【解析】句意:當(dāng)他正在睡覺的時候,山姆敲門。while后通常跟進(jìn)行時態(tài),表示某個動作正在發(fā)生或者動作的持續(xù)。during在……期間,介詞不引導(dǎo)從句;as強(qiáng)調(diào)主從句動作時間一般是持續(xù)相同時間;if如果,不合題意。故選A。

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