2. 外语
  3. We see lighting (before we hear) the thunder (because) sound travels (more slowly) than (light is).

We see lighting (before we hear) the thunder (because) sound travels (more slowly) than (light is).

admin2008-11-13  73
问题 We see lighting (before we hear) the thunder (because) sound travels (more slowly) than (light is).
选项 A、before we hear
B、because
C、more slowly
D、light is
答案D
解析 改为light does．比较项是动词travel，故重复的话应用助动词does．
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成人本科学位英语

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