I have no doubt that he will pass the exam, but I still think there is something about _____ he has really got everything ready.

A．that

B．whether

C．how

D．Why

债权人可以将合同的权利全部或者部分转让给第三人，但是下列情形之一的除外（）。

A.债务人可以亲自履行债务的

B.根据合同性质不得转让

C.按照当事人约定不得转让

D.合同附有条件的

E.依照法律规定不得转让