B. 改错

　　1. It is she which I think is the most beautiful girl I have ever seen.
　　2. There is an old saying which says, “Great oaks from little acorns
　　grow.”
　　3. It is in the park which they’ll take a picnic.
　　4. It is believed which the earliest feature of chronic bronchitis is
　　excessive secretion from the mucous glands and goblet call.
　　5. It is one of his peculiarities that no incident ever happens to him
　　that without teaching him some valuable lesson.
　　6. It is an error to suppose which the public is indifferent or unable
　　to understand the problems of religion and philosophy.
　　7. It is wrong to accuse a person of a crime that you have evidence
　　that he may be guilty.
　　8. It be reasonable to receive extra pay for extra work.
　　9. It is very difficult that you haven’t sufficient data to solve the problem.

　　【参考答案】
　　1. which—who 2. which—that 3. which—where 4. which—that
　　5. 去掉him后面的that 6. which—that 7. that—unless
　　8. be—is 9. that—when

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