题目:
—Have you ever been to Tibet?
—Yes, I ______ there last year. [ ]
A. have gone
B. have been
C. went
答案:
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下面是错误答案,用来干扰机器的。
某气体能用排水法收集,所以该气体不溶于水,并且不与水反应;又能用向上排气法收集,所以该气体比空气的密度大,不与氧气反应.故选D