—Sorry, I'm late.
—It's OK. However, you________come to the company today, for it is Saturday.
[     ]
A. couldn't have  
B. needn't have
C. wouldn't  
D. couldn't
It's hard to say what kind of person he is.Sometimes he is very friendly；at other times he________be
very cold.
[     ]
A．can  
B．must  
C．will  
D．shall
________it have been the failure to pick up directions from the ground control that caused the air crash?
[     ]
A．Must  
B．Could  
C．Would  
D．Should
—No one was prepared for the teacher's questions.
—We________read the lesson yesterday evening.
[     ]
A. must have  
B. could have  
C. should have  
D. might have
The little child ______ go out alone at night，so he ______ walk in the dark that night.
[     ]
A. daren't；didn't dare to
B. doesn't dare；dare not to
C. isn't dare to；dared not to
D. doesn't dare to；dare not to
I told your friend how to get to the hotel, but perhaps I________have driven her there.
[     ]
A. could  
B. must
C. might  
D. should
John promised his doctor he________not smoke, and he has never smoked ever since.
[     ]
A. might  
B. should
C. could  
D. would
Often he________sit for hours doing nothing at all when he was in low spirits.
[     ] 
A. should  
B. would
C. could  
D. might
— Could I use your computer to type a letter?
— You________have my computer if you don't take good care of it.
[      ]
A. shall not    
B. might not
C. needn't    
D. shouldn't
-Tom said that Mr Johnson was unfair to him.
-I really wonder how he________that to the teacher.
[     ]

A．dare to say  
B．dare saying
C．not dare say  
D．dared say

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