题目内容
18．If I ______finish my homework，my mother _____let me go to Lucy's party tonight．（ ）| A． | don't； won't | B． | don't； doesn't | C． | didn't； won't |
分析 如果我不完成作业，我妈妈今晚就不让我去参加露西的聚会了．
解答 答案：A 考查否定句．根据句子结构，if引导的真实性条件状语从句，此时遵循"主将从现"原则，即主句用将来时，而if条件状语从句用一般现在时来代替将来时，所以本句第一个空要有现在时完成句子，排除C．第二个空要用将来时完成句子，故选择A．
点评 考查否定句．准确的分析句子时态，用合适的动词形式完成否定句．
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