be good at do well in 这两个后面是加do 还是 doing

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be good at do well in 这两个后面是加do 还是 doing
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be good at do well in 这两个后面是加do 还是 doing
be good at do well in 这两个后面是加do 还是 doing

be good at do well in 这两个后面是加do 还是 doing
at 和 in 都是介词,后面的动词要用doing形式的.所以是doing.