单项选择题

Only later ___ what a terrible thing had happened.

A．they have realized
B．did they realize
C．they realized
D．they realize
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单项选择题
He has won the first place, __ is clear from the expressions on his face.
A．that
B．as
C．what
D．when
单项选择题
I appreciated __ the opportunity to work abroad three years ago.
A．having been given
B．having given
C．to have been given
D．to have given
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