【题目】 --Could you help me with some math problems?
--Sure. That’s _______ I’m here.
A. whether B. how C. when D. why
在线课程【答案】 D
【解析】
试题分析：考查表语从句；句意：你能帮我解决这个数学问题吗？是的，这就是为什么 来这的原因。根据语境可知选D项。
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