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You mother is ill,so you must ___a doctor.A.call B.calls C.to call D.called

分类: 作业答案 • 2022-01-09 18:05:21

问题描述：

You mother is ill,so you must ___a doctor.A.call B.calls C.to call D.called

答

A
must 情态动词,后接动词原形.