We can hardly believe such a young boy ______ travel around the world all by himself.

A. may B. need C. should D. must

 

C

【解析】

試題分析：句意：我們很難相信這樣一個(gè)年輕的男孩子竟然獨(dú)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。

考點(diǎn)：考查情態(tài)動(dòng)詞

 

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