题目内容
17．Why _________ you join the art club？You draw so well．（ ）| A． | not | B． | do | C． | don't | D． | won't |
分析 为什么你不参加美术俱乐部？你画画如此之好．
解答 答案：C．考查助动词．句意"为什么你不参加美术俱乐部？你画画如此之好．"．Why not和Why don't都表达一种询问的口气，提建议的语气Why not+do something．Why don't+人称+do something．结合you join可知，答案是C．
点评 考查助动词．协助主要动词构成谓语动词词组的词叫助动词，此类题要结合语境，选择合适用法完成试题．注意时态，人称，单复数等变化．还要注意一些习惯用法．
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