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!