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  3. It is difficult ______a world record and even more difficult to ______it.

It is difficult ______a world record and even more difficult to ______it.

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问题 It is difficult ______a world record and even more difficult to ______it.
选项 A、keeping, set
B、keep, set
C、set, keep
D、to set, keep
答案D
解析 创造一项新的世界纪录很难，而要保持则更难。“创造世界纪录”应该是“set a world record”，在此题中应该用动词不定式作前半句真正的主语，“保持”用“keep”，故选D。
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