单项选择题

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

A．original
B．mixture of
C．rhythm
D．and
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单项选择题
Tom regretted (to blame) his sister (for) the mistake, for he later found it was his own fault.
A．to blame
B．for
C．later
D．own
单项选择题
They were (used to) (hear) him (singing) in a cheerful voice in the classroom when he thought (no one) was near.
A．used to
B．hear
C．singing
D．no one
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