【題目】The Smiths were having dinner________the earth began to shake.

A. while B. when

C. as soon as D. Since

【答案】B

【解析】

句意：史密斯一家正在吃晚飯，這時大地開始搖晃起來。A. while正當……的時候；B. when此時；C. as soon as一……就；D. Since自從。when有“正在這個時候”的意思，表示當某一個動作正在發(fā)生時，突然發(fā)生了另一件事，故答案B符合題意。

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