His mother is ill. he ___ stay at homeA.mayB.mustc.have toD.has to

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His mother is ill. he ___ stay at homeA.mayB.mustc.have toD.has to
His mother is ill. he ___ stay at home
A.may
B.must
c.have to
D.has to

His mother is ill. he ___ stay at homeA.mayB.mustc.have toD.has to
D 不得不
表示没有其它选择

D
表示客观条件的限制,不得不