作业帮Tom__look after his mother.She has been ill these days A.have to B.has to C.had to D.will have to
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Tom__look after his mother.She has been ill these days A.have to B.has to C.had to D.will have to
Tom__look after his mother.She has been ill these days A.have to B.has to C.had to D.will have to
Tom__look after his mother.She has been ill these days A.have to B.has to C.had to D.will have to
选B.
Tom是第三人称单数,所以选择has to（不得不）.此句句意：Tom不得不照顾他的妈妈,（因为）她的妈妈（这几天）病了.
B.has to
第三人称单数，一般现在时即可
B，第三人称单数，has been ill 说明一直在生病直到现在，用C说明这些事都过去了
选B。Tom是第三人称单数，把have to排除，又因为She has been ill these days是现在完成时，所以应该选择has to.
B.Tom 是第三人称单数，而have的第三人称单数是has.
Tom__look after his mother.She has been ill these days A.have to B.has to C.had to D.will have to
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