The teacher have thought Johnson was worth it or she wouldn’t have wasted time on him, I suppose.
A.should B.can C.would D.must
The teacher have thought Johnson was worth it or she wouldn’t have wasted time on him, I suppose.
A.should B.can C.would D.must
D
must have done表示对过去所做事情的肯定判断,表示“一定……”。