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麻烦老师解答:When the telephone r

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麻烦老师解答:When the telephone r
When the telephone rang, I happened _____ in the kitchen, but when I came over to get it, it rang off. [     ]
A. to cook
B. to have cooked
C. to be cooking
D. having cooked

麻烦老师解答:When the telephone r
C