________ he didn't know much English, he got out his dictionary and looked up the word “cough”.A.SinceB.SoC.AsD.Why
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C解析解析：“他不懂得很多英语”是he got out his dictionary and looked up the word “cough” 的原因，故前一个分句是个原因状语从句。选项中的so和as都可以表示原因，但since起说明的作用，因此C为正确