单项选择题

______ a rainy day, we'd better put the picnic off and stay at home.

A．It was
B．It is
C．It being
D．It has been
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单项选择题
In the advanced course, students must take objective tests ______ monthly intervals.
A．with
B．on
C．for
D．at
单项选择题
About two thirds of the population in China ______ in the countryside.
A．is still living
B．were still living
C．was still living
D．are still living
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