单项选择题

I have no doubt（）he will get through the examination.

A．whether
B．as
C．that
D．if

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单项选择题
（）you return those books you have borrowed to the library immediately you will have to pay a fine

A．Until
B．Provided
C．If
D．Unless
单项选择题
Judging from what he said, Jack seemed（）everything already.

A．understand
B．to be understanding
C．understandable
D．to have understood
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