单项选择题

______ you were busy, I wouldn't have bothered you with my questions.

A．If I realized
B．Had I realized
C．Did I have realized that
D．As I realized
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单项选择题
He ______ his son by giving him too much money.
A．damaged
B．hurt
C．spoiled
D．harmed
单项选择题
The machine can't be perfected overnight; in fact, it should be improved ______ .
A．one after another
B．by turn
C．fight away
D．step by step
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