单项选择题

Why haven't you taken the medicine It ______ before dinner

A．should have been taken
B．has been taken
C．is taken
D．should have taken
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单项选择题
Little ______. that I was never able to see that kind old man again.
A．I thought
B．was I thinking
C．I would think
D．did I think
单项选择题
I ______ an old schoolmate while taking a walk in the park yesterday.
A．got into
B．went over
C．came across
D．took on
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