If you______a heart-attack or stroke victim who needs your assistance, your first response should be to stay calm and urge bystanders to call for an ambulance.
【正确答案】 D
【答案解析】解析：选项A为“找到”；选项B为“进入，探究”；选项C为“经过，路过”；选项D为“遇到，遇见”。根据题意，此处为假定的场景，故选D。