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
My sole object was to get shelter _________ the snow, to get myself covered and warm.
A．for
B．off
C．from
D．over
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