单项选择题

Under the present system, state enterprises must ______ all profits to the government.

[A] turn down
[B] turn up
[C] turn out
[D] turn in
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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
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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