There ________ sign of life on Mars.A.seem to beB.seems not to beC.seems to be noD.isn't seem to be
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C解析解析：本题考查There seem (s) to be...句式的否定式结构。此句型的否定形式既可否定seem，也可在后面的主语前加不定代词no。上面的例句可以说There seems (to be) no sign of life on Mars. 也可以说成：There doesn't seem (to be) any sign of life on Mars. 句意为：火星上面似乎没有什么生命迹象。因此C项正确。