单项选择题

It may have been at Christmas ______ John gave Mary a handbag.

A．before
B．who
C．that
D．when
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单项选择题
Neither Tom nor his parents ______ at home.
A．is
B．are
C．has
D．was
单项选择题
______ of danger in the street at night, she had to go home, with a friend her.
A．Warning, following
B．Having warned, following
C．Having been warned, following
D．Warned, followed
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