单项选择题

________ does it take you to wash all the dishes

A．How often
B．How much
C．How long
D．How fast
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Don’t get off the bus _________ it has stopped completely.
A．until
B．when
C．if
D．since
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It was not known ________ he had said during the interview.
A．whether
B．where
C．that
D．what
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