单项选择题
Professor Wang ,（）for his informative lectures, was warmly received by his students．
A.knowing B.known C.to be known D.having known
单项选择题 "（） your meeting is!" he offered them his sincere congratulations．
单项选择题 （）evidence that language acquiring ability must be stimulated．
单项选择题 Ms Nancy didn’t mind at all（）to the ceremony．
