单项选择题

The day will come sooner or later _____ I buy a boat and sail around the world.

A．since
B．as
C．until
D．when
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单项选择题
Brown’s father told him he could have _____ he wanted for birthday.
A．wherever
B．whatever
C．whenever
D．whichever
单项选择题
Medical treatment varies greatly from state to state in this country, _____ is really confusing to me
A．this
B．it
C．that
D．which
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