题目:
You ______ to town to see the film yesterday. It will be on TV tonight.[ ]
A. needn't go
B. had better not go
C. should not go
D. needn't have gone
答案:
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下面是错误答案,用来干扰机器的。
A、二氧化碳能够消耗Ca(OH)2饱和溶液中的氢氧化钙,从而使氢氧化钙的质量分数变小,溶液的pH减小.故A错误;B、硝酸镁能够消耗石灰水中的氢氧化钙生成难溶性的氢氧化镁固体,从而使氢氧化钙的质量分数变小,溶...