未知题型
expose vt. 暴露;揭露;使曝光,常与介词 to 连用,表示 “ 使暴露于（） 1 In summer, __________ the sun can be very harmful to your skin. 2 The soil was washed away by the flood, _____bare rock.
【参考答案】
["being exposed to","exposing"]
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