单项选择题

Just take such books ______ are needed for teaching the freshmen.

[A] that
[B] which
[C] as
[D] what

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单项选择题

He ______ his new job with confidence.

[A] set out
[B] set about
[C] set off
[D] set down

单项选择题

The scientist ______ his great energy and endurance to his habit of, dozing off whenever he wanted.

[A] contributed
[B] attributed
[C] devoted
[D] distributed

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