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
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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
单项选择题
_________a teacher, one must first be a pupil.
A．Being
B．Having been
C．To be
D．To have been
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