求助 GWD-10-16

Q16:

While digging in the Egyptian desert, huge fossil bones have been found by paleontologists, which appears to have been the second most massive dinosaur that ever lived.

A. huge fossil bones have been found by paleontologists, which appears to have been

B. huge fossil bones have been found by paleontologists, which appear to be from

C. it appears that paleontologists have found huge fossil bones that are from

D. paleontologists have found huge fossil bones from what appears to be

E. paleontologists have found huge fossil bones, which are from what appear to be

答案

到底what 指代什么, 从逻辑意思上好象应该是 fossil bones可是为什么用appears?

想不通呀,就要考了,请NN帮帮忙吧