----Look at the boy running on the playground. Is it David? ---- It ______ be him. I saw him go to the teachers’ office just now.
#53899
A
mustn’t
B
can’t
C
may not
D
needn’t
推荐题目
Li Ming is in poor health. He should pay more attention _________ exercise.
#57164
A
to take
B
to taking
C
for taking
D
in taking
