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Loulan is believe by many people to have been gradually

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Loulan is believe by many people to have been gradually
Loulan is believe by many people _____gradually covered over by sandstorms
A to be
B to have been
C have been
D was
Loulan is believe by many people to have been gradually
B
动词不定式完成式时被动态,表示一个发生在谓语动作之前的动作.
题意为:许多人认为楼兰是渐渐被沙尘暴所湮埋的.先是cover发行,后是believe发生