题目内容

—— __   Mary cleaning her room?     ——No, she is __  .
A．Does, readsB．Can, readC．Is, readingD．Does, reading
C
此题考查现在进行时的一般疑问句的基本句式结构，be+主语+现在分词及其简略回答。Mary为单数第三人称做主语，谓语动词应用单数，所以用is，句意：玛丽正在清扫房间吗？不，她正在读书。所以选C。
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