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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单项选择题
_______people in our village grow tobacco.
A． Not many
B． Only some of
C． Not much
D． Just a few of
单项选择题
The manager, as well as his advisers, _______to attend the world fair.
A． are agreed
B． were agreed
C． have agreed
D． has agreed
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