单项选择题

Rock music was (original) (a mixture of) country music and (rhythm) (and) blues.

A．original
B．a mixture of
C．rhythm
D．and
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单项选择题
They sat (together) (to make) (a room) (for) an old lady.
A．together
B．to make
C．a room
D．for
单项选择题
(A great many teachers) (firmly) believe English is one of the (poorest—taught) subjects in high schools (at present).
A．A great many teachers
B．firmly
C．poorest—taught
D．at present
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