-Why is Tom absent today? -No idea. He ____ be ill at home.

-Why is Tom absent today? -No idea. He ____ be ill at home.
A、might
B、can
C、must
D、should
【正确答案】：A
【题目解析】：【考点点击】本题考查情态助动词 might的推测性意义。【要点透析】根据答句 No idea可知,说话人是在推测Tom可能病了,并不含肯定的意味,所以排除C项;而can一般用于疑问句和否定句中,所以排除B项;而 should没有表示推测的用法。故本题选A。