单项选择题

The tomato juice left brown ______ on the front of my jacket.

A．spot
B．point
C．track
D．trace
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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．when
B．while
C．until
D．though
单项选择题
Mass production is ______ only in an economy with a highly developed technology.
A．feasible
B．permissible
C．allowable
D．receivable
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