单项选择题

He came back late, ______which time all the guests had already left.

A．at
B．after
C．by
D．during
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单项选择题
When Mr. Jones gets old, he will______over his business to his son.
A．take
B．hand
C．think
D．get
单项选择题
_____you are familiar with the author’ s ideas, try reading all the sections as quickly as you possibly can.
A．As long as
B．Ever since
C．So that
D．Now that
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