单项选择题

________ the temperature falling so rapidly, we couldn't go on with the experiment.

A．With
B．For
C．As
D．Since
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单项选择题
I was halfway back to the cottage where my mother lived _________ Susan caught up with me.
A．though
B．until
C．when
D．while
单项选择题
Operations which left patients _________ and in need of long periods of recovery time now leave them feeling relaxed and comfortable.
A．injured
B．exhausted
C．deserted
D．abandoned
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