单项选择题

Questions 5 to 7 are based on the following conversation.
Why is lightning sometimes NOT seen during a thunder storm().

A. It doesn’t always occur.
B. It is too faint to seen.
C. It happens in a distant city.
D. It is concealed by clouds.

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Questions 5 to 7 are based on the following conversation. Why is lightning sometimes NOT seen during a thunder storm(). 您的浏览器不支持 audio 元素。