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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

試題分析：句意：我們很難相信這樣一個年輕的男孩子竟然獨自周游世界。Should可以表示驚訝的語氣“竟然”，A. may可以，可能，B. need需要， D. must必須，所以選C。
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