单项选择题

We could not have fulfilled the task in time if it（）for their help.

A．was not
B．is not
C．had not been
D．has not been

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单项选择题

Jane is the only student in the class（）got full marks in the exam.

A．which
B．whose
C．that
D．whom

单项选择题

（）is known to the world, Mark Twain is a great American writer.

A．As
B．Which
C．That
D．Who

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