单项选择题

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

A. Leading
B. kinds of person
C. have enjoyed
D. all their lives
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(As) I haven' t read the novel, I can't (tell) you (how) I think (of) it.
A. As
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C. how
D. of it
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(Having rejected) by (everyone), the student (representative) (resigned) the committee.
A. Having rejected
B. everyone
C. representative
D. resigned
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