单项选择题

The henpecked man was still smiling ______ the door opened and his wife came in.

A．when
B．since
C．because
D．unless
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单项选择题
I like ______ when my girl friend met me at the airport.
A．it
B．that
C．these
D．them
单项选择题
It is partly ______ the summer day is longer that everyone cheers up.
A．for
B．that
C．because
D．the reason
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