单项选择题

______ it or no, his discovery has created a stir in scientific circles.

A．Believe
B．To believe
C．Believing
D．Believed
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单项选择题
Please be careful when you are drinking coffee in case you ______ the new carpet.
A．crash
B．pollute
C．spot
D．stain
单项选择题
If only the committee ______ the regulations(规章) and put them into effect as soon as possible.
A．approve
B．Will approve
C．can approve
D．would approve
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