We have't heard from David since he left Shanghai.(对划线部分提问,划since he left Shanghai）
We have't heard from David since he left Shanghai.(对划线部分提问,划since he left Shanghai）
英语人气：349 ℃时间：2020-01-28 00:54:53
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How long haven't you heard from David?How much are these vegetables?(保持句意不变）=How much do these vegetables cost?=What's the price of these vegetables?
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