21. it can’t be denied that the diaoyu islands are ________ part of
a. a; / b. a; the c. the; / d. /; an
22. traffic conditions in
a. is worsening b. have worsened c. have been worsening d. worsened
23. you might search on the internet for professors and their courses about this university ____ may interest you.
a. where b. that c. which d. who
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