单项选择题

His illness made him ______ of concentration.

[A] incompetent
[B] unable
[C] incapable
[D] powerless

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单项选择题

How is it ______ your roommate's request and yours are identical

[A] if
[B] so
[C] what
[D] that

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Very few scientists ______ completely new answers to the world's problems.

[A] come up with
[B] come out
[C] come round
[D] come up to

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