单项选择题

The reason ______ the little boy died was lack of medical care.

A. why
B. because
C. for
D. as
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I don’t play basketball any more, ______ when I was a child.
A. but I used to
B. I used to
C. but I used to do
D. I used to do
单项选择题
Smoking does you more ______ than good.
A. bad
B. wrong
C. harm
D. fault
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