单项选择题

The teacher asked his students what oil was ______.

A．made of
B．made by
C．made up of
D．made from
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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
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
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