Which of the following sentences conveys a fact?  
#86769
A
Maryandhersonmustbehomebynow.
B
Carelessreadingmustgivepoorresults.
C
It’sgettinglate,andImustleavenow.
D
Hemustbeworkinglateattheoffice.
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He ________ get into his own house because he has lost his keys.
#88359
A
mustn’t
B
doesn’t have to
C
can’t
D
needn’t
 He ______ the test again, in which case, his mother will be very disappointed. 
#89549
A
might fail
B
must have failed
C
should fail
D
could have failed
He ___ work in Hangzhou, did he?
#88928
A
usedn’t
B
didn’t used
C
used to
D
usen’t to
 But for the party, he ________ of hunger fifteen years ago. 
#89382
A
would have died
B
would die
C
must have died
D
must die