单项选择题

Can you tell me ________ there is plenty of rain in spring

A. how
B. why
C. when
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单项选择题
How careless he was! He ______ a lot of important ideas while reading.
A. kept
B. missed
C. passed
单项选择题
I ______ housework when there was a knock at the door.
A. did
B. was doing
C. am doing
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