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

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

admin2008-11-13  32
问题 We see lightening (before we hear) the thunder it (causes) because sound travels (more slowly) than (light is).
选项 A、before we hear
B、causes
C、more slowly
D、light is
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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