题目内容

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