题干
______the heavy rain, we ______the town.
A：But for; should have reached
B：Because of; would have reached
C：During the period of; we would reach
D：In spite of; we should have reached
答案(点此获取答案解析）
A
中，
，
，点D为BC中点，
，垂足为点
，则
等于（） 