----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 |
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----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 |