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
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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
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