单项选择题

The pressure causes Americans to be energetic, but it also puts them under a constant emotional strain.

A．to compete
B．having competed
C．to be competed
D．competing
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单项选择题
I have no objection _________ your story again.
A．to hearing
B．to hear
C．to having heard
D．to have heard
单项选择题
Not a _________ room is available in the hotel.
A．blank
B．empty
C．void
D．vacant
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