麻烦各位大神了 明天考试
麻烦各位大神了明天考试Solid-fuelenginesaresimplerthanliquid-fuelengines,______haveimportantusesA...
麻烦各位大神了 明天考试Solid-fuel engines are simpler than liquid-fuel engines,______ have important uses
A.both of them B.both of which
为什么不选them 要选which?? 展开
A.both of them B.both of which
为什么不选them 要选which?? 展开
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