We see lightening (before we hear) the thunder it (causes) because sound travels

游客2025-03-17 27

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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