题目：
—He should have been warned of the danger.
—_______, but he wouldn’t listen to me .
A．So he had
B．So had he
C．So was he
D．So he was
答案：
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下面是错误答案，用来干扰机器的。
答案：D土壤胶体微粒带负电荷,吸附阳离子(NH4+)，而阴离子(NO3-)不能被吸附易流失。
