问题详情

Although he was______in his efforts to persuade us of the justness of his cause, his past history,______with failures, prevented us from being any more than skeptical at his words.
A．tireless… marred
B．sage… coupled
C．resourceful . . . immaculate
D．unassuming … tinged
E．unyielding … touched请帮忙给出正确答案和分析，谢谢！