问题补充：
You an A on your composition, but there were some spelling mistakes.
A. should receive
B. could have received
C. would receive
D. must have received
答案：
A. should receive
(答案→)B. could have received
C. would receive
D. must have received
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、
