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
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
英语人气:860 ℃时间:2019-09-19 08:07:57
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