问题描述:
do you often see Tomstudy in the library?No,but he is often seen play football in the playgroud.
为什么第一个often后面接动词原形 第二个often后面却接的是过去分词.
为什么第一个often后面接动词原形 第二个often后面却接的是过去分词.
问题解答:
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