单项选择题

You're always late. You ______ late three times this week.

A．are being
B．were
C．had been
D．have been
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单项选择题
No sooner had they got the goods covered up ______ it started raining hard.
A．when
B．than
C．then
D．after
单项选择题
______everything means to know nothing.
A．To know
B．Knowing
C．One knows
D．You know
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