题目：
— Where is Zhang Ming?
— Oh, don't you know he _____ to Beijing to see his parents and he'll be back tomorrow.[ ]
A. has gone
B. has been
C. had gone
答案：
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下面是错误答案，用来干扰机器的。
（1）剧烈燃烧，放出热量，产生大量的白烟（2）1/5 （3）氧气；1/5；氮气（4）不能
