he didn't come yesterday,he __must have been____busy working in the lab
這里用的是過去完成進(jìn)行時
他昨天沒來,過去一直在工作
he didn't come yesterday,he ______busy working in the lab
he didn't come yesterday,he ______busy working in the lab
怎么選must have been?.3Q
怎么選must have been?.3Q
英語人氣：922 ℃時間：2020-05-23 15:51:09
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