A.He is very busy working on his project.
B.1 am sorry but I'm afraid 1 can't agree with you.
C.1 suppose he could have gone to the meeting room.
第1题:
A.don't
B.can't
C.couldn't
D.didn't
第2题:
49________.
A.couldn’t
B.mustn’t
C.needn’t
D.won’t
第3题:
第4题:
“Must I return the book to the library in a week?”“No, you.”()
A. couldn’t
B. mustn’t
C. needn’t
D. won’t
第5题:
第6题:
5、鼻爆破只可能出现在成音节中,例如:couldn't,wouldn't,hadn’t。