He sat there ,waiting for his son 还有 My mum was in her room,absorbed in her experiment

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• He sat there ,waiting for his son 还有 My mum was in her room,absorbed in her experiment这两句是不是考主动和被动的关系吖 其实用ing形式不是表示现在进行吧 不是表示主动关系吗
• He sat there ,waiting for his son 还有 My mum was in her room,absorbed in her experiment为什么第一句用ing形式 第二句要用ed形式吖 不是说ing表主动 ed表被动吗 那第二句还是伴随状语吗
• He sat there,( )for his son A waiting B waited C to wait Dwait 选什么吖 还有一句My mum was in her room,（ ）in her experiment A absorb B absorbed C absorbing D to absorb 选什么
• He sat there ,waiting for his son 还有 My mum was in her room,absorbedin her experiment为什么第一句用ing形式 第二句要用ed形式吖 不是说ing表主动 ed表被动吗
• He sat there ,waiting for his son 还有 My mum was in her room,absorbed in her experiment
• He sat there ,waiting for his son 还有 My mum was in her room,absorbedin her experiment
• He sat there ,waiting for his son 还有 My mum was in her room,absorbed in her experiment
• He sat there ,waiting for his son 还有 My mum was in her room,absorbedin her experiment
• 将二项式（1-2x)^5展开,可得含x^3项的系数是