2. 外语
  3. I am ______ of his chances of passing the examination because he has no! worked hard enough.

I am ______ of his chances of passing the examination because he has no! worked hard enough.

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问题 I am ______ of his chances of passing the examination because he has no! worked hard enough.
选项 A、ambiguous
B、ambitious
C、dubious
D、rational
答案C
解析 形容词辨义。这四个选项的词性都是动词，其中ambiguous表示“有多种意思的；意思含糊的”，如：an ambiguous reply(意思含混的答复)；ambitious是指“野心勃勃的；有抱负的”，如：They are ambitious although they are poor．(他们虽穷却很有志气。)dubious表示“令人怀疑的；引起疑虑的；不可靠的；可能有问题的”，如：a dubious compliment(意义不明的恭维)．；rational表示“理性的，合理的，推理的”，如：a rational suggestion(合理的建议)。根据句意，对他是否能通过考试表示怀疑，应该选择 C)。
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大学英语六级

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