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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It was (during) the 1990s (that) the friendship between Edward and Jeremy reached (their) (highest) point.
A. during
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Not only (we lost) all our (memory), but we (also) came close to (losing) our lives.
A. we lost
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C. also
D. losing
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