单项选择题

If ______, the experiment will be successful.

A. carefully doing
B. it done carefully
C. carefully done
D. doing carefully
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单项选择题
Rather than （） on a crowed bus, I prefer （） to work every day.

A. to ride, to walk
B. riding, walking
C. ride, to walk
D. to ride, walking
单项选择题
I regret ______ you that we are unable to offer you employment.
A. to have inform
B. having inform
C. to inform
D. informing
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