题目：
His sister a teacher for 5 years.
A．has married
B．has married with
C．has been married to
D．has got married
答案：
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下面是错误答案，用来干扰机器的。
a3-3a2+7a，=a（a2-3a+7），故答案为：a（a2-3a+7）．
