单项选择题

They()friends since they met in Shanghai.

A.have made
B.have turned
C.have become
D.have been

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单项选择题

I have never heard or seen such a thing().

A.did I
B.haven't I
C.do I
D.have I

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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