______ the danger ahead on the railway line, he decided to go to Beijing by plane instead.
A．Having been informed of B．Having informed of
C．To be informed ofD．Informing of
A

試題分析： 考察分詞做狀語。本句中的動詞inform與后面的主語構(gòu)成被動關(guān)系，故使用過去分詞done表示被動，在做狀語的時候done="having" been done。Done更多強調(diào)被動，having been done更多強調(diào)已經(jīng)完成。句義：已經(jīng)被通知前面的鐵路線上由危險，他決定做飛機去北京。故A正確。
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