全国通用2011届高考英语二轮总复习经典易错题详解与试题预测：  考点 10   副词性从句    命题角度 2    条件状语从句和结果状语从句的正确运用

1.(典型例题) It is known to all that __ you exercise regularly, you won’t keep good health.

  A. unless       B. whenever   C. although   D. if

 [考场错解]  B

   [专家把脉]  很多考生认为本题应该用whenever来引导时间状语从句，事实上分析本句结构和句意可知，it实际上是替代后面从句的，句子的真正结构为:_   you exercise regularly，you won’t keep good health。因此，应该用unless，句意为“除非你经常有规则地锻炼，否则不会有好身体的”。

  [对症下药]  A

2.(典型例题)—Shall Brown come and play computer games?

  —No,__ he has finished his homework.

  A. when        B. if          C. unless     D. once

  [考场错解]  A或B