If unexpected events stop you from finishing your tasks, you should ______.
选择一项： a. It is not necessary to tell the receiver how to get to the place. b. The sender should clearly tell the receiver the reasons for the activity. c. The letter usually begins with “ Dear ” followed by the receiver.s name or title.
答案是:正确答案是：It is not necessary to tell the receiver how to get to the place.
