单项选择题

（） we have finished the course, we shall start doing more revisions work.

A．For now
B．Now that
C．Ever since
D．By now

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单项选择题
The （） of the Mississippi River is located more than two hundred miles from its mouth.

A．source
B．beginning
C．resource
D．origin
单项选择题
His mother died when he was five, his father never remarried, and by the time he was eight （） in three different countries.

A．had lived
B．was lived
C．was living
D．will have lived
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