7、B:Istudybyworkingwithagroup.A:Howdoyoustudyforatest?B:Istudyby…Ⅳ.Exploration(10mins)探讨介词“by”的用法三、Step3Traininginclass(当堂检测,7mins)根据提示,用含有by的短语完成各1) Annie went to Beijing _______(乘火车) yesterday.2) His grandfather made a living _________(靠卖水果) in the past.3) The scientists have to arri