问题
选择题
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
答案：B
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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