单项选择题

______Lily______ I have been to the Great wall.

A．Either; or
B．Neither; nor
C．Both; and
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单项选择题
His school is in the Northeast, thousands of kilometres ______.
A．away
B．long
C．far
单项选择题
I slipped and fell while I______.
A．am cleaning windows
B．clean windows
C．was cleaning windows
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