单项选择题

Medical accidents（）by drugs have attracted much attention in that country.

A．causing
B．to be caused
C．be caused
D．caused

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单项选择题
There was no proof to show that Charles had committed the crime,（）he was set free.

A．but
B．for
C．or
D．so
单项选择题
The decision about such a big project can not be made（）each member of the board agrees.

A．if
B．unless
C．though
D．as
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