单项选择题
She preferred that he（）it in the kitchen.
A.didB.doesC.should doD.had done
单项选择题 The originally clean river is now seriously polluted and unfit（）.
单项选择题 Never（）such a nice chair.
单项选择题 盐酸纯品为澄清无色或微黄色有刺激性气味的液体，一般浓度在（）左右。
