题目内容
19.Loulan,a stopping point on the famous Silk Road between the East and the West,is believed _______ over by sandstorms from AD 200to AD 400.( )A. | to have gradually covered | B. | gradually to be covered | ||
C. | gradually to have covered | D. | to have been gradually covered |
分析 据信楼兰,东西方之间的著名的丝绸之路上的一个停靠点,在公元200年到400年之间逐渐被沙尘暴覆盖.
解答 答案是D.本题考查非谓语动词;题干中考查句式sb./sth.be believed+动词不定式,表示"据信…",楼兰是被覆盖,并且事情是过去发生的;故用动词不定式的完成式,故选D.
点评 首先判断选项中的动词在句中是以谓语还是非谓语形式出现,然后根据选项在句中的功能结合非谓语的基本用法做出合理的判断.
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