单项选择题

Mary has got a furl mark in the test. She（）very hard all the time.

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

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单项选择题
The student is different（）all the students I have seen,

A．on
B．among
C．with
D．from
单项选择题
The shirt（）was very expensive.

A．bought last week
B．he bought week
C．which he bought it last week
D．he bought last week
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