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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单项选择题
John seems a nice person.______, I don't trust him.
A．Even though
B．Even so
C．Therefore
D．Though
单项选择题
I hope that you'll be more careful in typing the letter. Don't ______ anything.
A．lack
B．withdraw
C．omit
D．leak
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