问题补充：
单选题HelooksforwardwithgreatinteresttheShanghaiExpointhesummerholiday.A.to seeB.of seeingC.to seeingD.for seeing
答案：
C解析考查固定搭配。with great interest是插入语，He looks forward____ the Shanghai Expo in the summer holiday，考查look forward to doing结构，所以选C。
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