【题目】Parents should take seriously their children’s requests for sunglasses ______ eye protection is necessary in sunny weather.
A. because of B. though
C. because D. unless
在线课程【答案】C
【解析】考查状语从句中连词的用法。句意：太阳镜可保护眼睛，这是常识，所以不选D项。可知此处是原因状语从句，故选C。
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