单项选择题

He has been working as an engineer ______graduation.

A. while
B. as
C. since
D. which
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单项选择题
It is ______of you to go into the dark room only by yourself at midnight.
A. efficient
B. proud
C. bold
D. greedy
单项选择题
It was for some reasons ______ he didn't tell you the truth at that time.
A. which
B. why
C. that
D. so
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