one added to three is four中added to three 在句子中充当什么成分?顺便说一下为什么用added,

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• one added to three is four中added to three 在句子中充当什么成分?顺便说一下为什么用added,
• one added to three is four中added to three 在句子中充当什么成分?顺便说一下为什么用added,
• Three added to four makes seven 中add为什么加ed?而且被动语态不是应该要有be动词吗?
• 看到for three years一般用现在完成时,此题用的是一般过去式,是什么用法?i ______ in a foreign company for three years.still,i don't regret having given up the well-paid post.AworkedBhave workedcwas working 选A 求讲解.