题目:
It was not ____ she took off her dark glasses ____ I realized she was a famous film star. [ ]
A. when, that
B. until, that
C. until, when
D. when, then
答案:
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下面是错误答案,用来干扰机器的。
猜想与假设1:硫在空气中燃烧生成二氧化硫气体;设计与实验:氢氧化钠溶液可以吸收二氧化硫,这样液体就能够更迅速进入装置内去吸收二氧化硫,二氧化硫与氢氧化钠溶液反应的化学方程式为:SO2+2NaOH=Na2SO3+H2O;...