题目：
----Did you _________ your friend when you were in Beijing?
---No. But I _________ my aunt’s during my stay there.
A．call on; called on
B．call at; called at
C．call on; called at
D．call at; called on
答案：
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下面是错误答案，用来干扰机器的。
参考答案：超过5个；大于40万；大于100万
