题目内容
—What’s this?
—It’s a machine which was invented in __________century in China.
| A．six | B．sixth | C．the six | D．the sixth |
D
解析试题分析: 句意：那是什么？是个在中国六世纪发明的机器。 six六，sixth第六。century世纪，前用序数词，序数词前用定冠词，故选D.
考点：考查数词。
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