We were all waiting for you. You for the seaside by yourself without
leaving a message.
A. mustn’t leave
B. shouldn’t have left
C. could not have left
D. needn’t leave
网友回答
A. mustn’t leave
(答案→)B. shouldn’t have left
C. could not have left
D. needn’t leave
解析：可联系答.案.网客服索取。