单项选择题

I had just started back for the house to change my clothes ______ I heard voices.

A. as
B. when
C. after
D. while
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单项选择题
All factories and mines are ______ by government officials.
A. examined
B. surveyed
C. inspected
D. investigated
单项选择题
He moved away from his parents, and missed them ______ enjoy the exciting life in the big city.
A. too much to
B. enough to
C. very much to
D. much so as to
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