my mother is in the kitchen,________(prepare)supper.填什么,怎么分析?

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my mother is in the kitchen,________(prepare)supper.填什么,怎么分析?
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my mother is in the kitchen,________(prepare)supper.填什么,怎么分析?
my mother is in the kitchen,________(prepare)supper.
填什么,怎么分析?

my mother is in the kitchen,________(prepare)supper.填什么,怎么分析?
preparing

preparing.前面有be动词,逗号后面是补充的