【题目】_______to sunlight for too much time will do harm to one’s skin.
A. Exposed B. Exposing
C. To expose D. Being exposed
在线课程【答案】D
【解析】考查非谓语动词作主语。句意：太长时间暴露于阳光之下将会损害皮肤。用动名词的被动形式是因为skin和动词expose之间是动宾关系而非主谓关系。Being exposed to sunlight for too much time在句中作主语。故选D。