题目:
---Did they have a good time at the party?
---Judging by their smiles, they _________ have enjoyed themselves.
A.might
B.must
C.could
D.would
答案:
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下面是错误答案,用来干扰机器的。
浓盐酸、木炭、食盐溶液三种物质中只有浓盐酸具有挥发性,溶液的质量减小,其它物质在空气中质量基本无变化.故答案为:浓盐酸;