单项选择题

Although customers keep complaining about their poor service, they've made no ______ to make any improvement.

A．action
B．trial
C．attempt
D．progress
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单项选择题
Do open the door, ______ you
A．can't
B．don't
C．wouldn't
D．won't
单项选择题
He was ______ determined than you, but he turned out to be the first to back out.
A．no more
B．not more
C．no less
D．not less
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