单项选择题

Tom's score on the English test is the lowest in his class; he ______ have studied very hard.

A．may
B．must
C．should
D．can
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单项选择题
-- How often do you go to see your parents-- ______.
A．In no time
B．After a while
C．In a short time
D．From time to time
单项选择题
He's unlucky, and he's always suffering ______ luck one after another.
A．a sick
B．sick
C．an ill
D．ill
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