To make fried potatoes, first, the potatoes ____ and ____ . Then they ____ into the oil and after they ____ , ____ with kethcup.
A.have been peeled / are sliced / were put / have been fried / are served
B.are peeled / sliced / are put / are fried / served
C.were peeled / sliced / are put / had been fried / are served
D.peeled / sliced / were put / have been fried / serve

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