[单选题]题目16未回答满分1.00未标记标记题目. He ________ his homework when his mother came back yesterday evening.
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2024-02-03 16:06:25
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[单选题]题目16未回答满分1.00未标记标记题目. He ________ his homework when his mother came back yesterday evening.

a. was doing
b. did
c. does
d. is doing
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