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
答案：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 |