Although she has a lot of problems, she manages to remain ________.
A．optimisticB．cautiousC．concernedD．upset
A
形容詞辨析。A樂觀的；B謹(jǐn)慎的；C關(guān)心的；D難過的；句意：盡管她有很多問題，她仍然保持樂觀。
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