Gunpowder is generally believed __________ in ancient China.A．to have inventedB．_刷题宝

题干

Gunpowder is generally believed __________ in ancient China.

A．to have invented

B．being invented

C．to have been invented

D．having invented

上一题下一题 0.85难度单项选择更新时间:2011-07-06 09:22:31

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