单项选择题

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

A．by
B．during
C．at
D．after
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I've never seen the young man ______ next to the director.
A．sits
B．sitting
C．sat
D．to sit
单项选择题
This suitcase is ______ heavy for me to carry.
A．enough
B．very
C．so
D．too
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