题目内容
The math problem is so hard. I really don’t know .
| A．how to do it | B．how to do | C．what to do it | D．where to do it |
A
解析试题分析：how如何，怎样；what什么；where在哪儿。句意：这道数学题是这么难。我真的不知道如何解答。选项B缺少逻辑宾语，结合语境可知选A。
考点：考查疑问词+不定式短语。
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