单项选择题

The meeting is postponed until next week, _________ we won be so busy.

A．since
B．when
C．while
D．that
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单项选择题
_________ still young, Mr. George has had amazing achievement in cosmology.
A．When
B．As
C．Although
D．Since
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
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