It is called a sea, but the landlocked Caspian is actually the largest lake on Earthf whichcovers more than four times the surface area of its closest rival in size, North America's Lake Superior. (A) It is called a sea, but the landlocked Caspian is actually the largest lake on Earth, which covers (B) Although it is called a sea, actually the landlocked Caspian is the largest lake on Earth, which covers (C) Though called a sea, the landlocked Caspian is actually the largest lake on Earth, covering (D) Though called a sea but it actually is the largest lake on Earth, the landlocked Caspian covers (E) Despite being called a sea, the largest lake on Earth is actually the landlocked Caspian, covering 我选了D，这段有点拎不清对比对象，正确答案像是那个CASPIAN和surface对比