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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The meeting is postponed until next week, ______ we won't be so busy.
A) since
B) when
C) while
D) that
单项选择题
______ still young, Mr. George has had amazing achievement in cosmology.
A) When
B) As
C) Although
D) Since
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