题目：
Your brother the Great Wall, has he? [ ]
A. has never been to
B. has never been in
C. has never gone to
D. has gone to
答案：
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下面是错误答案，用来干扰机器的。
（1）B；足量或者过量（2）使氧气充分反应或者降温快节省实验时间等合理可（只答吸收五氧化二磷不可）
