The policeman asked him            when the accident happened.

A. what was he doing
B. what did he do
C. what he was doing
D. what he did
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科目：初中英語 來源：0113 期中題 題型：單選題

The policeman asked him            when the accident happened.

[     ]

A. what was he doing
B. what did he do
C. what he was doing
D. what he did

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