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We can hardly believe such a young boy ______ travel around the world all by himself.
A.mayB.needC.shouldD.must
C

试题分析:句意:我们很难相信这样一个年轻的男孩子竟然独自周游世界。Should可以表示惊讶的语气“竟然”,A. may可以,可能,B. need需要, D. must必须,所以选C。
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