单项选择题

—Did Jack come back early last night —Yes. It was not yet eight o'clock ______ he arrived home.

A．before
B．when
C．that
D．until
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单项选择题
—I'm going to travel to Sydney. Would you please tell me about your experiences there —______ Let's discuss it over lunch.
A．Go ahead
B．It just depends
C．That's wonderful
D．By all means
单项选择题
—Why do you think I am not popular among my classmates —Maybe you don't talk about topics that interest them, ______ everything you say is friendly.
A．as if
B．as long as
C．on condition
D．even though
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