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
—Susan, will you please go and empty that drawer— ______
A．What for
B．What is it
C．How is it
D．How come
单项选择题
Let's keep to the point or we ______ any decisions.
A．will never reach
B．have never reached
C．never reach
D．never reached
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