The reason why coal is still a very valuable source of power is________atomic power is not available in sufficient quantity.

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问题 The reason why coal is still a very valuable source of power is________atomic power is not available in sufficient quantity.

选项 A、because
B、as
C、that
D、for

答案C

解析 本题考查表语从句。The reason及why引导的从句为主语部分,空前的is是系动词,其余部分为表语部分,用以说明主语。故所填词为引导表语从句的从属连词,表原因,故C项为答案。其他三项都引导原因状语从句,其中because和as是从属连词,for是并列连词。
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