单项选择题

 _____ scores of times ,but he still couldn’t understand it .
A Having explained  B Having been explained
C Though it was explained  D It was explained

A.A
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单项选择题
—That’s a big building going up, isn’t it? — this construction job?
A.Were you just watching      B.Did you just watch
C.Have you just watched   D.Didn’t you just watch
单项选择题
Dr. Frank failed many times but he finally to find a successful way to solve the problem.A.broke off B.broke up C.broke down D.broke through
A.A.
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