问题

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
B:should
C:must
D:may
正确答案是:
同类题型
It was the very place _________ the soldiers fought over sixty years ago.
____________ to tell him the news; he has been told of it.
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I often have chicken and fruit ________ dinner.[ ]
. Mary was only too ready to help others, seldom, _____, refusing them when they turned to her.