GRE考试资讯

【单选题】 DUBIOUS:
A．(A) inadvertent
B．(B) oblivious
C．(C) intentional
D．(D) skeptical
E．(E) certain

网考网参考答案：E
网考网解析：
To be dubious means to be "skeptical or uncertain," whereas to be certain means to be "sure or absolute." Therefore, certain is most nearly opposite in meaning to dubious. 查看试题解析出处>>