单项选择题

When ______ his homework, he heard someone singing.

A. he does
B. he doing
C. doing
D. did
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单项选择题
The flower needs ______.
A. to water
B. watered
C. watering
D. being watered
单项选择题
Little ______ that the girl has fallen in love with him.
A. he knows
B. he doesn't know
C. does he know
D. doesn't he know
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