We see lightning A(before we) hear the thunder B(because) sound travels C(more s

游客2025-03-14  7

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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