—No idea. He ________ be ill at home.

A. might B. need

C. should D. would

【答案】A

【解析】考查情态动词。句意：——汤姆今天为何缺席？——不知道。也许他生病在家。might可能，也许；need必要；should应该，按理说；would会。从句意判断说话人的把握不大，故选A项。