The stars visible at night are immensely distant, ______ is why they appear only

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问题 The stars visible at night are immensely distant, ______ is why they appear only very small points of light.

选项 A、it
B、which
C、that
D、this

答案 B

解析本题测试点是关系代词。which，that都可引导限定性定语从句。但which可用来引导非限定性定语从句，that则不能。本句中的从句是非限定性定语从句，修饰前面的整个句子。故选B为正确答案。

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