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
His well-written short stories made him a（）man.

A. respectable
B. respectful
C. respective
D. respecting
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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