单项选择题

I was halfway back to the cottage where my mother lived _________ Susan caught up with me.

A．when
B．while
C．until
D．though
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单项选择题
_________ the temperature falling so rapidly, we couldn't go on with the experiment.
A．Since
B．For
C．As
D．With
单项选择题
Among all the changes resulting from the _________ entry of women into the work force, the trans- formation that has occurred in the women themselves is not the least important.
A．massive
B．quantitative
C．surplus
D．formidable
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