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

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

选项 A、before we
B、because
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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成人本科学位英语

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