单项选择题

With the introduction of the computer, libraries today are quite different from () they were in the past.

A．that
B．what
C．which
D．those

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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

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

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