Is everything________we need to_______?
Yes.You needn't worry about it.
A.which;has done B.which；doing
C.that；has done D.that;done
为什么这题选择D?A或者C哪里错了?
题目应该改为：
Is everything________we need to do _______?
Yes.You needn't worry about it.
A.which;has done B.which；doing
C.that；has done D.that;done