单项选择题

Could you please ______ why you can"t come to attend the meeting

A．explain
B．understand
C．give
D．reach
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单项选择题
You can fly to London this evening ______ you don t mind changing the flight in Paris.
A．until
B．if
C．where
D．before
单项选择题
She didn t tell the reason ______ she was absent from the important lecture.
A．what
B．which
C．how
D．why
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