题型:名词解释 Tom hardly had time for concerts at that time, ________?A.wasn't heB.was heC.did heD.didn't he 查看答案
题型:名词解释 已知文法G[E]:E→T|E+T|E-TT→F|T*F|T/FF→(E)|I该文法的句型T+T*F+I的最左素短语为__(1)__,句柄为__(2)__。空白(1)处应选择()A.句型中第一个TB.T+TC.ID.T*F 查看答案