Although the teacher had told Bob the hi
题型:选择题
问题:
Although the teacher had told Bob the history of telephone, Bob didn’t know when ____.
A.it was invent
B.was it invented
C.it was invented
D.it invented
Although the teacher had told Bob the history of telephone, Bob didn’t know when ____.
A.it was invent
B.was it invented
C.it was invented
D.it invented