【題目】Some students were talking loudly ____the head teacher came into the classroom.

A. while B. as soon as C. when D. as long as

【答案】C

【解析】句意：當校長進入教室的時候，一些學生正在大聲地談論著。A. while當……時候；后引導的從句的動詞用進行時； B. as soon as一……就； C. when當……時候； D. as long as只要。故選C。

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