It is believed to _____ over by sandstorms from AD 200 to AD 400.A．gradually coverB．be gradually being coveredC．have been gradually coveredD．be gradually covere-高中英语-n多题

◎ 题干

It is believed to _____ over by sandstorms from AD 200 to AD 400.

A．gradually cover	B．be gradually being covered
C．have been gradually covered	D．be gradually covered

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