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英语单句改错(已给出答案),请解释为什么这样改及有关语法句法,

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英语单句改错(已给出答案),请解释为什么这样改及有关语法句法,
1.No one 【who has seen (A)】【him work (B)】in the lap can deny that Smith【has an interest(C)】 and【 aptitude for (D)】 chemical experimentation.
C 改为has an interest in
2.Someone in the office 【had made (A)】a mistake,and the company【regretted(B)】【to have caused (C)】【the customer inconvenience.(D)】
C 改为having caused
3.Anyone 【with necessary equipment (A)】can manufacture【his (B)】own outdoor furniture; 【however (C)】,a certain degree of patience and skill 【is (D)】also required.
D 改为are
4.How I wish John【knew(A)】 how to 【apply (B)】grammatical rules properly and【 recognize (C)】the fact that he is nearly always【in the wrong (D)】
C 改为recognized
5.It is true that 【the average man (A)】often uses in his own vocabulary 【that (B)】was once technical language 【not meat (C)】【for him(D)】
B 改为what
1.has an interest in sth 对……有兴趣
2.regret doing 指对做过的事感到后悔
而regret to do 指后悔自己将不去作某事
3.A and B看作复数,此题 a certain degree of patience and skill 是复数
4.前面的knew是过去式,这里并列的recognized也过去式
5.【that (B)】没修饰任何先行词,不是定语从句,从句was once technical language 【not meat (C)】【for him(D)】缺主语,用what