单项选择题

（）I saw the machine, I could not have imagined how efficiently it works.

A．But for
B．Because
C．But that
D．If

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单项选择题
It is difficult to （）a conversation with all this noise around us.

A．carry on
B．account for
C．bring up
D．get through
单项选择题
Not long ago, a person whom I know very well was （）an accident.

A．related to
B．involved in
C．included in
D．subjected to
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