题目内容
Gunpowder is generally believed __________ in ancient China.
| A.to have invented | B.being invented | C.to have been invented | D.having invented |
C
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。
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