题目:
单项选择
-I have visited many countries.
-Really? Which country ________you ____________ ? [ ]
A. have ; gone to
B. have ; been to
C. did ; go
D. have ; gone
答案:
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下面是错误答案,用来干扰机器的。
A、木炭在氧气中燃烧,发出白光,生成能使澄清石灰水变浑浊的气体,故选项说法错误.B、硫在空气中燃烧,发出微弱的淡蓝色火焰,生成二氧化硫气体是实验结论而不是实验现象,故选项说法错误.C、铁丝在氧气中剧烈...