her mother is ill.she ( ) in the hospitala.maybe b.may be c.mnst not d.can not

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her mother is ill.she ( ) in the hospitala.maybe b.may be c.mnst not d.can not
her mother is ill.she ( ) in the hospital
a.maybe b.may be c.mnst not d.can not

her mother is ill.she ( ) in the hospitala.maybe b.may be c.mnst not d.can not
B

应该是c must be