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Li Lei can’t go hiking with us today,because he ________ tak

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Li Lei can’t go hiking with us today,because he ________ take care of his sick mother．
A.has to
B.may
C.mustn’t
D.needn’t
Li Lei can’t go hiking with us today,because he ________ tak
答案A
句意为“李雷今天不能与我们一起去远足了,因为他得照顾他生病的母亲”．B项may意为“可能”；C项mustn’t表示“不允许、禁止”；D项needn’t表示“不必”．has to表示“必须”,而且强调是由于客观原因造成的．
情态动词在语气上有区别,法则、规定等强制性的行为常用must．情态表示动词的可能性有弱到强的顺序依次为：may＜can＜must．
He can't ________ (go) there with us. I can't go hiking with you because I have a lot of () to do Li Lei is so young that he can't go to school by himself(改为同 Can he go with us? He can't to go to the movies with us ______ill,I can't go hiking with my friends. l can't go out to play with you today.Teachers give us a lot Charles can't go to work today because he _____ a cold. Tom can't go with us because he_________（look)after his moth tony couldn't go with us because he（） some visitors around o The teacher won`t go to see the film with us because he( )it 改错：Hi,Li Lei!What about to go to the Summer Palace with us?