2. 外语
  3. We see lightning A(before we) hear the thunder B(because) sound travels C(more slowly) than D(light is).

We see lightning A(before we) hear the thunder B(because) sound travels C(more slowly) than D(light is).

admin2012-08-03  23
问题 We see lightning A(before we) hear the thunder B(because) sound travels C(more slowly) than D(light is).
选项
答案D
解析 比较级前面是实义动词travel，后面应该用does代替。
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