Question

9．It is believed that Loulan was gradually covered by sandstorm from AD 200 to AD 400．（根据上句完成下句）
Loulan is believed _____________________________________________________________．

Answer 1

分析 大家相信楼兰是从公元前200年到公元前400年逐渐被沙尘暴淹没的．

解答 答案：to have been gradually covered by sandstorms  from AD200 to AD400．
本句考查句型sb/sth is reported/believed to do/to have done，可以转化成It is reported/believed that sb、sth do/have done；因为楼兰是被掩埋的，用不定式完成式的被动，故答案为to have been gradually covered by sandstorms from AD200 to AD400．

点评 对于句型转换的题目要分析原句的句型结构，并找出同义句型或者相同意思的表达方式，或者使用非谓语动词的形式，或者从句的形式以及一些特殊句式等，要根据句式结构特点进行灵活选择．