AsastoppingpointonthefamousSilkRoad,Loulanisbelieved

問題詳情：

As a stopping point on the famous Silk Road, Loulan is believed __________  by sandstorms from AD 200 to 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

【回答】

C

【詳解】

考查固定句式。句意：大家認為作為絲綢之路的中轉點而出名的樓蘭，是在公元200至400年間慢慢地被沙塵暴覆蓋的。Sth./Sb. is believed to have done…“某人/某物據相信已經做了”因為這件事已經發生，先於believe發生，所以用不定式的完成式，副詞置於助動詞後，故選C。

知識點：固定句型

題型：選擇題