单项选择题

He usually gets up ______ 7 every morning.

[A] at
[B] about
[C] on
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单项选择题
______ receiving the gift, Dr. Roach sent me a thank-you card.
[A] Since
[B] On
[C] For
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The teacher gave two books to ______ student.
[A] each
[B] all
[C] any
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