单项选择题

（）, the experiment is sure to succeed.

A．If carefully doing
B．If carefully done
C．If it done carefully
D．If it doing carefully

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单项选择题
The product was attacked when it was first （）, but gradually it was accepted.

A．advanced
B．occurred
C．appeared
D．challenged
单项选择题
Only a few students （） through the final examination.

A．breezed
B．ran
C．saw
D．went
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