单项选择题

No sooner（）than I realized I'd left the document at home.

A．have we sat down
B．had we sat down
C．we had sat down
D．we sat down

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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
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
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