昨天他在打篮球
He was playing basketball yesterday
以上为机器翻译结果，长、整句建议使用 人工翻译 。
昨天的这个时候他正在打篮球。
He was playing basketball at this time yesterday.
youdao
昨天他采时，我们正在打篮球。
When he came yesterday, we were playing basketball.
昨天他来时，我们正在打篮球。
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