单选题You _____ an A on&nb

问题补充：

单选题You_____anAonyourcomposition,butthereweresomespellingmistakes.A.should receiveB.could have receivedC.would receiveD.must have received

答案：

B解析考查情态动词用法。根据there were some spelling mistakes 可知，本句是对过去的虚拟，所以排除AC，B表示本可以得A，符合题意。D意为一定得了A，不符合题意、