Which of the following sentences conveys a fact?  
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A
Maryandhersonmustbehomebynow.
B
Carelessreadingmustgivepoorresults.
C
It’sgettinglate,andImustleavenow.
D
Hemustbeworkinglateattheoffice.
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All our teachers demand that we ___________.
#87507
A
worked hard
B
work hard
C
will work out
D
should be worked hard
 You could have seen Fang Zuming________ yesterday morning.
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A
did you come
B
if you came
C
had you come
D
if you should come