单项选择题

One significant improvement in the future car will probably be______.

A．its power source
B．its driving system
C．its monitoring system
D．its seating capacity
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单项选择题
Your hair wants ______. You'd better have it done tomorrow.
A．cut
B．to cut
C．cutting
D．being cut
单项选择题
The pressure ______ causes American to be energetic, but it also puts them under a constant emotional strain.
A．to compete
B．competing
C．to be competed
D．having competed
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