题目

After my husband died suddenly from a heart attack，my world crashed around me．My six children were all under 10，and I was burdened with the responsibilities of earning a living，and   caring for the children．I was fortunate to find a wonderful housekeeper to care for the children during the week，but from Friday nights to Monday mornings，the children and t were alone． One Friday evening I came home from work to find a big pretty German shepherd off our doorstep．This dog seemed to intend to enter the house．The children liked “German” immediately and begged me to let him 找出下面句子中的通假字并解释 师者，所以传道受业解惑也________