—What’s this? 
—It’s a machine which was invented in __________century in China.
A．sixB．sixthC．the sixD．the sixth
D

試題分析: 句意：那是什么？是個在中國六世紀(jì)發(fā)明的機器。 six六，sixth第六。century世紀(jì)，前用序數(shù)詞，序數(shù)詞前用定冠詞，故選D.
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