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21.Itisknowntoallthatgunpowderis___Chineseinvention,asisthecompass,___instrumentthatyouuseforfindingdirections.A.a;the.B/;anC.a;anD./;the
题目内容：
21.It is known to all that gunpowder is ___ Chinese invention,as is the compass,___ instrument that you use for finding directions.A.a; the.B/; an C.a;an D./;the优质解答
C.a;an
刚提及,用不定冠词
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优质解答
刚提及,用不定冠词
请在客户端右上角评价点“满意”即可,
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