题目

______at in this way, the present situation about birds flue doesn’t seem so disappointing. A. Looking           B. Looked       C. Having looked     D. To look   答案： B 根据“分词短语作状语，其逻辑主语须与主句的主语保持一致”的原则，因主语the present situation与look at 之间为被动关系，故答案为B。  

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