题目内容
19.As a stopping point on the famous Silk Road,Loulan is believed by sandstorms from AD 200to AD 400.( )A. | to be gradually covered over | |
B. | to gradually cover over | |
C. | to have been gradually covered over | |
D. | to gradually have covered over |
分析 考查不定式,句意:作为著名的丝绸之路的一个停靠点,楼兰被认为已经被沙尘暴从公元200年到公元400年逐渐覆盖.
解答 答案:C,不定式的动作cover在句子谓语动词的be believed之前发生,这时不定式常用完成时态to have done,句子主语LouLan和cover之间是被动关系,所以用被动,所以选 C.
点评 不定式不只是to do,还有时态和语态.
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