单项选择题

I can't find the key to my office, ______ have lost it on my way home.

A．would
B．must
C．should
D．ought to
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单项选择题
There are three colors in the British flag, ______ red, white and blue.
A．rarely
B．really
C．namely
D．naturally
单项选择题
There was a heavy fog this morning, so none of the planes could （）.

A．get through
B．pull out
C．take off
D．break away
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