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．competing
C．to be competed
D．having competed
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单项选择题
We agreed to accept ______ they thought was the best tourist guide.
A．whatever
B．whomever
C．whichever
D．whoever
单项选择题
We object______ punishing a whole group for one person’’s fault.
A．against
B．about
C．to
D．for
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