填空题
A.
ea
se
B.m
ea
n
C.h
ea
d
D.h
ea
t
【参考答案】
C
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单项选择题
Adults sometimes envy children who play all the time ______ they themselves have to work, rain or shine.
A.while
B.once
C.since
D.though
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单项选择题
While I was waiting for her, I killed time ______ looking in the show windows.
A.by
B.with
C.in
D.over
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