题目内容
Anna hasn't come to school today. I think she _______ be ill.
[ ]
A. can
B. has to
C. may
D. should
B. has to
C. may
D. should
C
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---Do you know why Anna hasn’t come to school today?
---I’m not sure. She _______ be ill.
| A．can | B．should | C．must | D．may |