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

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Youmotherisill,soyoumust___adoctor.A.callB.callsC.tocallD.calledYoumotherisill,soyoumust___adoctor.A

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

You mother is ill,so you must ___a doctor.A.call B.calls C.to call D.called
A
must 情态动词,后接动词原形.