单项选择题

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

A．should have been taken
B．is taken
C．has been taken
D．should have taken
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单项选择题
Computer has the power to ______ people around the world to work together.
A．allow
B．permit
C．let
D．agree
单项选择题
I ______ an old schoolmate while taking a walk in the park yesterday.
A．got into
B．came across
C．went over
D．took on
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