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 51. _________ denotes currency in circulation plus bank deposits.A. The term “money supply”B. The term is “money supply”C. When the term “money supply”D. “Money supply” is the term 答案：A分析：缺主语。B，D中出现两个谓语，一定错。C中when多余，使得句子不完整。参考译文：术语货币储备是指流通货币加上银行存款。 

52. The Franklin stove, invented around 1742, ________, originally with a partially open front, and was designed to fit into a fireplace.A. was made of cast ironB. cast iron was made ofC. cast of iron was madeD. was of iron made cast 答案：A分析：invented around 1742为插入语，2个was为并列谓语。be made of 为固定搭配。参考译文：Franklin火炉发明于1742年，是用铁浇铸的，原先前面可以部分打开，而且设计成能正好装进壁炉。 

53. A few species of mushrooms cause death or serious illness _________.A. having eatenB. that they are eatenC. are eatenD. when eaten 答案：D分析：状语从句的省略结构。省略条件：由特定的状语从句引导词：although, though, even though, if, when, while, as, whether; 从句为主系表结构；从句主语和主句主语一致。省略方式：要同时省略主语和系动词。原句为：…… when mushrooms are eaten.参考译文：吃了一些种类的蘑菇会造成死亡或重大疾病。 

54. Some critics maintain _________ the mystery novel is a symbolic ritual of guilt and retribution.A. is thatB. that there isC. it isD. that 答案：D分析：that引导宾语从句。A，C中出现两个谓语动词，错；B中that引导的从句出现两个谓语动词，错。参考译文：一些评论家认为神秘小说是罪与罚象征性的仪式。 

55. _________ all cherry trees are very attractive when in bloom, some species with inferior fruit are cultivated especially for their flowers.A. AlthoughB. There areC. It isD. That 答案：A分析：后面句子完整，且出现了两个谓语动词，此处缺连接词。参考译文：尽管所有的樱桃树在开花的时候都很美丽，但它们中的一些不结果的种类专门种植用来观赏他们的花的。

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