问题补充:
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:
A. what were they doing
(答案→)B. what they were doing
C. what are they doing
D. what they are doing
解析:考查宾语从句。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。句意“你能告诉我那时他们在做什么吗?”故选B。
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