单项选择题

I slipped and fell while I______.

A．
[A] am cleaning windows

B．
[B] clean windows

C．
[C] was cleaning windows

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单项选择题
______Lily______ I have been to the Great wall.
A．
[A] Either; or

B．
[B] Neither; nor

C．
[C] Both; and
单项选择题
Great changes______ place since he left here.
A．
[A] have been taken

B．
[B] have taken

C．
[C] were taken
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