Although the teacher had told Bob the history of telephone, Bob didn’t know when ____. A.it.
AlthoughtheteacherhadtoldBobthehistoryoftelephone,Bobdidn’tknowwhen____.A.itwasinvent...
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
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