摘要：4 表示转折或对比 1) but表示转折.while表示对比. Some people love cats, while others hate them. 典型例题 --- Would you like to come to dinner tonight? --- I'd like to, I'm too busy. A. and B. so C. as D. but 答案D.but与前面形成转折.符合语意.而表并列的and. 结果的so.原因的as都不符合句意. 2) not-but- 意思为"不是--而是--" not 和but 后面的用词要遵循一致原则. They were not the bones of an animal, but of a human being.

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