题目内容
2．-____ your sister know Tom？-No，she ____．（ ）| A． | Do； don't | B． | Does； doesn't | C． | Do； do | D． | Does； does |
分析 --你妹妹认识汤姆吗？
--不，她不认识．
解答 答案：B．考查助动词．句意"--你妹妹认识汤姆吗？--不，她不认识．"．根据No否定回答可知，原句是一般疑问句，含有实义动词know，主语是sisiter单数，因此用助动词does，A，C不正确．否定回答用No，she doesn't．因此D不正确．答案是B．
点评 考查助动词，要根据时态，人称，结合语境选择不同助动词的用法．
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