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
Being colour-blind, Sally can’’t make a_______between red and green.
A．difference
B．distinction
C．comparison
D．division
单项选择题
______ something should go wrong, what would you do then
A．Supposing
B．Supposed
C．To be supposed
D．To suppose
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