当事人将自己在合同中的权利和义务一并转让给第三人必须（）。
A.通知对方当事人
B.与第三人协议
C.经法院批准
D.经对方同意
参考答案：D
_____ worries the doctor most was _______ they could find the cause of the disease.
A．What; how
B．That; that
C．What; what
D．How; what
潜水
