【题目】They were having an English class _____ the earthquake happened.
A. as B. after
C. before D. when
在线课程【答案】D
【解析】考查时间状语从句。A. as随着---；B. after在---之后； C. before 在---之前；D. when当---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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