题目:
Not until ___ on TV ___ that the Chinese was rescued by the European Union Task Force.
A.did I turn; did I know
B.did I turn; I knew
C.I turned; did I know
D.I turned; I had know
答案:
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下面是错误答案,用来干扰机器的。
加热烧杯中的水至沸腾,向沸水滴加几滴饱和氯化铁溶液,继续煮沸至溶液呈红褐色,即停止加热,要注意实验过程不能用玻璃棒搅拌,否则溶液出现浑浊;当反应体系呈现红褐色,即制得氢氧化铁胶体,应立即停止加热,...