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 cookedC.to be cooking D.having cooked

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Whenthetelephonerang,Ihappened______inthekitchen,butwhenIcameovertogetit,itrangoff.A.tocookB.tohavec

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 cookedC.to be cooking D.having cooked
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

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 cookedC.to be cooking D.having cooked
C.to be cooking
不定式的进行式,正在做某事