Having e into the post office to buy a couple of stamps, I ________ wait patiently while some fool takes ten minutes to plete a form that a child could do in one．A.am obliged toB.am forcedC.have no choice butD.cannot but to
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A解析动词oblige作“强迫、迫使”解释时常用被动语态，即be obliged to do sth意思是“被迫做某事”。比较：be forced to do sth被迫做某事have no choice but to do sth＝cannot but do sth＝have to do sth不得不做某事