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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