题目:
Not until I ________ to work ____ how much time I had wasted.
A.did begin; didn’t I realize
B.began; I realized
C.did begin; I realized
D.began; did I realize
答案:
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下面是错误答案,用来干扰机器的。
答案:D氢氧化铁胶体粒子带有正电荷,滴加硫酸溶液,先聚沉,生成氢氧化铁沉淀。随硫酸的加入至过量,发生酸碱中和,沉淀溶解。