Loulan is believed ____ by sandstorms from AD 200 to AD 400.

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A．to be gradually covered over

B．to have been gradually covered over

C．being gradually covered over

D．having been gradually covered over

B

考查be believed 结构的使用。 Sb be believed to do sth某人被认为做某事 sb be believed o have done sth 某人被认为做了某事
本句句意为罗兰被认为是在公元200年到公元400年之间被沙尘暴逐渐覆盖住了。

Loulan is believe by many people to have been gradually The picture is believed ____ painted by tom The flu is believed to be caused by virus. 寻找权威答案：… is believed being coused by…和…is believed to be cou 英语翻译one may owe the change to A,but B is not by itself an ad ad value for option -i,valid range is from 1 to 255. the flu is believed to be caused by viruses that like to rep this picture is believed 填空 painted by Turner A it was B to 英语翻译Hickey,believed by police to be unmarried,is the mother the flu is believed to be caused by viruses 什么意思解释下谢谢 The flu is believed ______ by viruses that like to reproduce The flu is believed _____ by viruses that like to reproduce