_________, the experiment is sure to succeed.
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A
If carefully doing
B
If carefully done
C
If it done carefully
D
If it doing carefully
推荐题目
The boy insisted ______ in a nearby school. 
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A
to be taught
B
being taught
C
on being taught
D
on teaching
we were ______ at the news of her sudden death.              
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A
astonishing
B
to astonish
C
astonished
D
astonish