单项选择题

The pressure ______ causes American to be energetic, but it also puts them trader a constant emotional strain.

A．to compete
B．competing
C．to be competed
D．having competed
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单项选择题
She ought to stop work; she has a headache because she ______ too long.
A．has been reading
B．had read
C．is reading
D．read
单项选择题
Sometimes I wish I ______ in a different time and a different place.
A．be living
B．were living
C．would live
D．would have lived
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