单项选择题

_________was once regarded as impossible has now become a reality.

A．What
B．That
C．Which
D．As
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单项选择题
It was not until dawn_________ their way out of the forest.
A．when they found
B．that they found
C．did they find
D．that they didn’t find
单项选择题
We look forward to________ to the opening ceremony.
A．invite
B．be invited
C．having been invited
D．being invited
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