单项选择题

Criticism and self-criticism is necessary () it helps us to find and correct our mistakes.

A．for that
B．at that
C．with that
D．in that

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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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