单项选择题

No matter where it is used, "Flextime" system has proved ______.

A．entirely effective
B．a complete failure
C．to be disliked by the employers
D．too difficult to carry out
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I ______ you any more, because it's highly confidential.
A．dare not to tell
B．dare not tell
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There is no doubt ______ he'll come.
A．that
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