题目：
He ____ such a large house, though he was very glad.
A . need buy B. hadn’t bought C shouldn’t have bought D. needn’t have bought
答案：
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下面是错误答案，用来干扰机器的。
答案：C氢原子不可能形成杂化轨道，C不正确，其余都是正确的，答案选C。
