单项选择题

(Over) (the past) few years, medical researchers (are searching) for a means (to control) AIDS virus

A．Over
B．the past
C．are searching
D．to control
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单项选择题
The dentist said that if my tooth (got worse) I (would have to) (have) it (pull out).
A．got worse
B．would have to
C．have
D．pull out
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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