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
______ he comes, we won't be able to go.
A．Without
B．Unless
C．That
D．Because
单项选择题
It is necessary that a student ______ his lesson before coming to class.
A．will prepare
B．prepares
C．must prepare
D．prepare
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