Yes．We have to say we are now facing unexpected difficulties ahead, but we firmly believe nothing can stop us from serving the people heart and soul, ________?A.can itB.cant itC.can theyD.cant they
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A解析陈述句部分有否定词nothing，附加部分用肯定形式。另外，习惯用it指代nothing，some-thing，everything等不定代词。