作业帮lt's a pity that必要时是否要换成lt was a pity that
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lt's a pity that必要时是否要换成lt was a pity that
lt's a pity that必要时是否要换成lt was a pity that
lt's a pity that必要时是否要换成lt was a pity that
过去时的时候应该要换的吧.