单项选择题

Complicated ______ the problem is, the electronic brain can solve it in a short period of time.

A．as
B．though
C．if
D．even
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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
单项选择题
In the advanced course, students must take objective tests ______ monthly intervals.
A．with
B．on
C．for
D．at
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