单项选择题

Last night someone rang me up at midnight, but he hung up ______ I could answer the phone.

A．before
B．as
C．until
D．after
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单项选择题
According to the passage, the note of the highest value is ______.
A．not high enough now
B．in circulation
C．a new, 50 -pound note
D．not the 20 -pound note
单项选择题
There are so many dresses there that I really don't know ______ to choose.
A．whether
B．when
C．which
D．why
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