A. basing B. based C. to be based D. to base
解答：选（B）此题过去分词做后置定语，并且base与其修饰的report之间动宾关系，因此用过去分词。
38. There are so many dresses there that I really don’t know _____ to choose.
A. whether B. when C. which D. why
解答：选（C）根据题意，空格处需要一个代替dress，在四个答案中只有C是代词，而whether，when，why均为副词或关系副词。
39. I think that Anna is _______ far the most active member in our group.
A. with B. at C. as D. by
解答：选（D）本题考查固定搭配，by far“到目前为止”，其余三项与far不搭配。与far搭配的短语还有as far as“就……，尽……”，far and away“肯定地，无疑地”，far and near“到处，四面八方”。
40. I’m still unable to make myself ________ in the discussion, which worries me a lot.
A. to be understood B. understanding
C. understood D. understand
解答：选（C）本题考查的是动词make的用法，make有两种基本用法，一是
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