2. 外语
  3. When ______ difficult problems, we should often take an optimistic attitude.

When ______ difficult problems, we should often take an optimistic attitude.

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问题 When ______ difficult problems, we should often take an optimistic attitude.
选项 A、faced
B、being faced
C、facing
D、having faced
答案C
解析 本题考查语态。首先考虑主句主语与分词之间的关系为逻辑上的主动关系, 排除A、B两项；分析句意, face并不在take an optimistic attitude之前, 排除D项, 故选C。
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