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

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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
单项选择题
Those（）want to watch the football match please hand in your money after school.

A．who
B．which
C．that
D．whom
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