题目内容
【题目】Can you tell me ________ at that time?
A.what were they doing
B.what they were doing
C.what are they doing
D.what they are doing
【答案】B
【解析】句意：你能告诉我那时他们在做什么吗？宾语从句用陈述句语序。排除A、C；at that time指的是过去的时间，故用一般过去时，排除D。所以答案是B。
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