单项选择题

With the introduction of the electronic computer, there is no complicated problem can be solved in a few hours.

A. but
B. which
C. that
D. what
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单项选择题
The mayor ______ a committee to discuss the beautification of the city.
A. provoked
B. evoked
C. invoked
D. convoked
单项选择题
She accepted his ______ about her dress with a smile.
A. complement
B. compliment
C. contribution
D. congratulation
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