题目内容
3．Listen!Marryis singing（sing） a beautiful song．分析 听！Marry正在唱一首动听的歌．
解答 答案：is singing 考查单词填空．根据题干中的listen可知时态是现在进行时，构成是主语+be+doing，主语是Marry，第三人称单数，系动词用is，sing的现在分词是singing，故答案是：is singing．
点评 解答此题的关键是根据语境推测要填内容表达的含义，然后能理解各选项内容，有时可能没有必要细细区分每个单词的含义，仅根据句子语气就可以判断出正确答案．
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