【正确答案】 B

【答案解析】[解析] 画线词eternal为形容词，意为“永恒的，永久的”，与B项never-ending(不停的，无限的)意思相近；例：I'm tired of your never-ending complaints. 我听腻了你那没完没了的抱怨。A项long意为“长(期)的(地)；渴望的”；例：We have, however, a rather long way to go. 然而，我们还有好长的路要走。C项boring意为“令人厌烦的，无聊的”；例：He's likeable enough, but a bit boring. 他挺讨人喜欢，就是有点无聊。D项extensive意为“广大的，广阔的；广泛的”；例：The teacher had both extensive knowledge and profound scholarship. 这位老师的学问博大精深。