单项选择题

_____ he completed his education abroad, he has been working for a travel agency in Shanghai.

A．As soon as
B．Since
C．By the time
D．When
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单项选择题
_____ we’ll do is to leave Mum a note to tell her that we won’t be back till tomorrow morning.
A．What
B．If
C．that
D．Whether
单项选择题
Einstein was the man _____ Theory of Relativity has influenced our ideas of time and space.
A．who
B．that
C．whose
D．of whom
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