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落不明的;在句中作表語 / 定語 Betty: Tony and Daming. What’s happened to them?] 物做主語 What happened to your cell phone? 人做主語 I happen to know his cell phone number. Lingling: They were walking more slowly than us.] Mr. Jackson: And look at those clouds! I think it’s going to rain. I’ll go back and look for them. look at/ see/ watch/ visit/ read/ look after look like look the same look fo