Question

用-ing形式的被動(dòng)語態(tài)合并句子

I had taught the boy many times．The boy still didn’t know how to do the exercised．

＝________, the boy still didn’t know how to do the exercises．

Answer 1

答案：
解析：

Having been taught many times現(xiàn)在分詞的完成被動(dòng)形式作狀語