根据我国《合同法》的规定，要约表示应当符合( )的规定。

A．内容具体确定

B．要约是一种行为

C．承担责任

D．表明经受合同的承诺

E．表明经受要约人承诺，要约人要受到要约的约束

(2013·天津12区二模)He never thought that his success came ________ he least wanted it.

A．until

B．since

C．when

D．while