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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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
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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