单项选择题

It happened to rain heavily ______ the morning of our marriage.

A．at
B．in
C．on
D．/
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As is known to all, friendship is ______ great importance in people's life.
A．in
B．of
C．with
D．for
单项选择题
A young child ______ he is, he can speak three foreign languages.
A．though
B．where
C．as
D．who
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