Both his parents look sad . Maybe they _________what's happened to him .
A: konw
B: must know
C: have known
D: knew
A: konw
B: must know
C: have known
D: knew
举一反三
- Both his parents look sad. Maybe they ______what’s happened to him. A: knew B: have known C: must know D: will know
- Both his parents look sad. Maybe they_______ what's happened to him. A: knew B: have known C: know D: will know
- Both his parents look sad . Maybe they _________what's happened to him. A: knew B: haveknown C: willknow
- Both his parents look sad. Maybe they __________ what’s happened to him.
- Both his parents look sad. Maybe they_what happened. A: knew B: knows C: have known D: has known