单项选择题

In my country, the ________ are all distributed free.

A．letters box
B．letters boxes
C．letter's box
D．letter boxes
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单项选择题
It was requested that all of the equipment ________ in the agreed time.
A．erected
B．would be erected
C．be erected
D．will be erected
单项选择题
It turned out that the children were not ________ for the accident.
A．to blame
B．to be blamed
C．to be blaming
D．to have been blamed
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