I helped Tom buy 还是I helped Tom bought用合适的形式:I helped Tom (b
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题目内容：
I helped Tom buy 还是I helped Tom bought
用合适的形式:
I helped Tom ____(buy) a watch.
那 did 后面的动词要改变原形吗?
在过去式里有没什么句子前面动词要改变,后面动词也要改变?
优质解答
help sb.do sth.
buy
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