单项选择题

How long do you suggest is it ______ he arrived there

A．when
B．before
C．after
D．since
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单项选择题
-- ______ that he managed to get the information --Oh, through a friend of his.
A．Where
B．What was it
C．How was it
D．Why was it
单项选择题
I'll write a letter to ______ people are on the list.
A．any
B．all
C．whoever
D．whichever
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