we are doing nothing but ---- there A sit B sitting 应该选哪个

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we are doing nothing but ---- there A sit B sitting 应该选哪个

we are doing nothing but ---- there A sit B sitting 应该选哪个
we are doing nothing but ---- there A sit B sitting 应该选哪个

we are doing nothing but ---- there A sit B sitting 应该选哪个
应该 sitting,这里是对应前面的doing
如果前面是do,后面就用动词原形,比如
we can do nothing but wait

sitting

选B,因为are是现在进行时态,所以动词do是用doing,同样的sit也要用ing形式,要注意双写

应该选B 因为前面是be + ing
如果前面的动词时do 则应该选A了