—Who did English homework better, Leo or Nick?

—Leo is more careful. I think Leo did _____ Nick.

A．as good as

B．as well as

C．better than

D．worse than

用于抵押的土地使用权有期限的，使用权人（）在权利存续期限内设定抵押权。

A.不可以

B.自愿约定

C.有第三人担保

D.仅可以