单项选择题

It was not until she got on the bus ______ she remembered she had left her keys at home.

A．when
B．which
C．that
D．where
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单项选择题
______ in his position, I'd have left there immediately.
A．was I
B．I was
C．Were I
D．I were
单项选择题
The number of students in this college ______ this year.
A．have doubled
B．has doubled
C．have been doubled
D．has been doubled
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