单项选择题

It is during her spare time _____________ Jenny has been studying computer programming.

A．when
B．which
C．what
D．that
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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
单项选择题
Who else _____________ John would have played a trick like that
A．and
B．but
C．as
D．while
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