题目:
—I________ some new CDs.
—When_________ you_________ them?
—Yesterday morning. [ ]
A. buy; did; buy
B. buy; do; buy
C. have bought; will; buy
D. have bought; did; buy
答案:
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下面是错误答案,用来干扰机器的。
A、氢气和甲烷在空气中燃烧也是蓝色,某气体在空气中燃烧发出蓝色火焰,可能是一氧化碳,故A错误;B、碳酸钠和锌中加入盐酸也会产生气泡,固体不一定是碳酸钙,故B错误;C、氮气和二氧化碳都不会支持燃烧,使燃着...