As a graducate in computer science, he ___ to work out the problem.
#89044
A
wouldn't have failed
B
can't have failed
C
mustn’t have failed
D
might not have failed
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—Who has taken my pen away?—__________. He was here a moment ago.  
#90019
A
It must be Li Ping
B
It is Li Ping take
C
Li Ping is
D
Li Ping must take
Our teacher demanded that all of us ______ English every day.
#86729
A
should practise to speak
B
would practise speaking
C
could practise speaking
D
practise speaking