Though he is always thinking much of himself,he ____be helpful when staying with othersA.can B.must C.should D.need

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Though he is always thinking much of himself,he ____be helpful when staying with othersA.can B.must C.should D.need
Though he is always thinking much of himself,he ____be helpful when staying with others
A.can B.must C.should D.need

Though he is always thinking much of himself,he ____be helpful when staying with othersA.can B.must C.should D.need
A


表示理论上的可能性

再如:
Swimming across the river can be dangerous



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