单项选择题

The physicists propose that our attention ________ the use of special methods of thinking and acting.

A．would be directed towards
B．should be directed towards
C．is directed towards
D．directs towards
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单项选择题
You'd better let me know as soon as there is a(n) ________ position in the branch office.
A．empty
B．vacuum
C．hollow
D．vacant
单项选择题
50（）

A．asked
B．to have asked
C．asking
D．being asked
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