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【题目】They were having an English class _____ the earthquake happened.

A. as B. after

C. before D. when

【答案】D

【解析】考查时间状语从句。A. as随着---;B. after---之后; C. before ---之前;D. when---时候。句意:地震发生时,他们正在上英语课。根据句意可知答案为D。

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