单项选择题

To our surprise, the stranger _____________ to be an old friend of my mother's.

A．turned into
B．turned out
C．turned over
D．turned up
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单项选择题
Who else _____________ John would have played a trick like that
A．and
B．but
C．as
D．while
单项选择题
Professor Bill had begun taking _____________ research work when he was in high school.
A．to do
B．doing
C．to doing
D．having done
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