单项选择。
Both his parents look sad . Maybe they _________what's happened to him .
A. knew B. have known C. must know D.will know
B
He has _______ been to Shanghai , has he ?
A. already B.never C.ever D. still
B
Have you met Mr Li ______?
A. just B. ago C.before D. a moment ago
C
The famous writer _____ one new book in the past two year .
A. is writing B.was writing C.wrote D.has written
D
—Our country ______ a lot so far .
—Yes . I hope it will be even ______ .
A. has changed ; well B. changed ; good
C. has changed ; better D. changed ; better
C
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