【題目】Friendship is one of the greatest things in the world, but sometimes it ______be difficult.

A.wouldB.canC.shouldD.must

【答案】B

【解析】

考查情態(tài)動詞用法。句意：友誼是世界上最偉大的事情之一，但友誼有時會很難。A. would將會，表示意志、愿望和決心；B. can可能，能夠；C. should應該，可以表示說話人的情感；D. must必須，一定要。結合后文be 可知表示偶爾的可能性，意為“有時會”，其后通常接“be (get, seem, become等)+形容詞”應用can。故選B。

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