摘要：9．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
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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
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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
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B. what they were doing
C. what are they doing
D. what they are doing