正确答案：选must
解析：must 在肯定句中,可以表示推测,而且可能性很大,比may,might 的可能性要大.
翻译：他不在学校,我想他一定是生病了.
有不明白的请继续追问,
He isn't at school .I think he ( )be ill.can,shall,must,has
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