His sister left home in 1998, andsince.
had not been heard of
has not been heard of
had not heard of
has not heard of
75.Is ____ necessary to complete the design before National Day?
76..I don’t think ____ possible to master a foreign language without much memory work.
77.Does ______ matter if he can’t finish the job on time?
78.It was not _____ she took off her glasses _____ I realized she was a famous film star.
79.I was disappointed with the film . I had expected ______ to be much better.