I’m always ________ about what I say because careless remarks are likely to hurt others’ feelings.
A．enthusiasticB．curiousC．doubtfulD．cautious
D

試題分析：句意為：我總是對我所說的話很謹慎，因為粗心的評述很有可能會傷害他人的情感。enthusiastic adj熱心的，熱情的；curious adj好奇的；doubtful adj懷疑的，可疑的；cautious adj小心的，謹慎的。故答案應為D。
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