两年前我去过上海 I was in Shanghai two years ago
我只去过上海一次 I visited Shanghai once
我去过上海
I have been to Shanghai.
以上为机器翻译结果，长、整句建议使用 人工翻译 。
我去过上海，也去过深圳。
I have been to Shanghai, and Shenzhen as well.
youdao
我去过上海很多次了。
I have been to Shanghai many times.
我去过上海好几次了。
I've been to Shanghai several times.
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