The boss____________ the worker how to do it, or the accident couldn't have happened.
#89996
A
can't have told
B
ought to tell
C
could have told
D
mustn't have told
推荐题目
Which of the following sentences conveys a fact?  
#86769
A
Maryandhersonmustbehomebynow.
B
Carelessreadingmustgivepoorresults.
C
It’sgettinglate,andImustleavenow.
D
Hemustbeworkinglateattheoffice.
You ______ be hungry already — you had lunch only two hours ago!
#88943
A
wouldn’t
B
can’t
C
mustn’t
D
needn’t