I was preparing______the coming contest while my mother was preparing_____supper in the kitchenA./,forB.for,/请说明原因

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Iwaspreparing______thecomingcontestwhilemymotherwaspreparing_____supperinthekitchenA./,forB.for,/请说明

I was preparing______the coming contest while my mother was preparing_____supper in the kitchenA./,forB.for,/请说明原因
I was preparing______the coming contest while my mother was preparing_____supper in the kitchen
A./,for
B.for,/
请说明原因

I was preparing______the coming contest while my mother was preparing_____supper in the kitchenA./,forB.for,/请说明原因
for /

B

选B

b

B