I don’t think Mary understood what you said, _____？
A. do I B. didn’t she C. did you D. did she
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47 Teenagers always long for the time which they are able to be independent.
A B C D
It turned out that the man was an excellent policeman working in New York, _____ had contributed a lot to the case.
A. that B. which C. who D. where
某分项工程分项代号网络计划如下图所示，其中关键线路有（）条。
A. 1
B. 2
C. 3
D. 4
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