单项选择题

Please send this envelope ______ Sarah.

A．to
B．by
C．for
D．什么都不填
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单项选择题
A: Your vacation is in two weeks, ______ it B: Yes, and I can't wait.
A．do
B．don't
C．is
D．isn't
单项选择题
______ smart your children are!
A．Why
B．When
C．How
D．Be
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