作业帮he's been there (twice) before.(对括号单词提问）
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he's been there (twice) before.(对括号单词提问）
he's been there (twice) before.(对括号单词提问）
he's been there (twice) before.(对括号单词提问）
How many times has he been there before?他去过那儿几次?
How many times has he been there?