单项选择题

It is estimated that much of a teenager's time is spent()with friends.

A．to talk
B．talking
C．being talked
D．having talked

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单项选择题
He kept his head, otherwise the accident ().

A．would happen
B．happened
C．would have happened
D．happens
单项选择题
()bricks, workers press clay into blocks and bake them to the requisite hard.

A．Being made
B．The making of
C．To make
D．Made
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