单选题
The movie begins with an image of rushing water and you initially can't make out what ______ that you're looking at until the body floats into the frame.
【正确答案】
D
【答案解析】本句的后半部分大意为：一开始你不知道自己看到的是什么，直到尸体漂入画面。make out后接宾语从句what it is，其中it为先行词，从句的真正主语为that you're looking at。