Gunpowder is generally believed __________ in ancient China.A．to have inventedB．being inventedC．to h

题目简介

Gunpowder is generally believed __________ in ancient China.

A．to have invented

B．being invented

C．to have been invented

D．having invented

题型：单选题难度：偏易来源：不详

考查固定搭配。Be believed to do…，被认为……，所以排除B,D；且主语Gunpowder和动词invent是动宾关系，所以要用不定式的被动形式，且invent发生在主句谓语动词believe之前，所以用不定式的被动完成时。选C。