(Leading) scientists are often the (kinds of person) who (have enjoyed) intellectual challenges (all their lives).

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问题 (Leading) scientists are often the (kinds of person) who (have enjoyed) intellectual challenges (all their lives).

选项 A、Leading
B、kinds of person
C、have enjoyed
D、all their lives

答案B

解析 名词单复数错误,应改为kind of persons。主语scientists是复数,其表语也应是相应的 persons。由于scientists只是一类人,kind用单数就行了。
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