—Who’s that boy reading in the study ? Is it David?—It __________ be David. I saw him go home just now.
#74950
A
must
B
can’t
C
may
D
shouldn’t
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He ______ it on schedule, but somehow he fell behind.
#62908
A
must have done
B
might finish
C
could have finished
D
could finish
I told Sally how to get here, but perhaps I ___ for her.
#63323
A
had to write it out
B
must have written it out
C
should have written it out
D
ought to write it out