l think we_______ learn to be useful to people ,so it's necessary for us to take part in socialactivities from time to time. A.may B.ought to C.can D.need

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l think we_______ learn to be useful to people ,so it's necessary for us to take part in socialactivities from time to time. A.may B.ought to C.can D.need

l think we_______ learn to be useful to people ,so it's necessary for us to take part in socialactivities from time to time. A.may B.ought to C.can D.need
l think we_______ learn to be useful to people ,so it's necessary for us to take part in social
activities from time to time. A.may B.ought to C.can D.need

l think we_______ learn to be useful to people ,so it's necessary for us to take part in socialactivities from time to time. A.may B.ought to C.can D.need
B.ought to 应该

B

选 B
应该的意思
如果选D 则应该变为need to do
其他几项明显意思不对