单项选择题

The conference（）a full week by the time it ends.

A．must have lasted
B．will have lasted
C．would last
D．has lasted

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单项选择题
It was simply for some special reason（）I didn't tell you the truth at that time.

A．why
B．that
C．which
D．so
单项选择题
Mary has got a full mark in the test. She（）very hard all these days.

A．will work
B．may work
C．must have worked
D．could have worked
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