______ that the problem was more than he could deal with,he called the police for help.

A.Having been realized　　　　　　　　　 B.To realize

C.Realized　　　　　　　　　　　　 D.Realizing

 

D

本題考查非謂語(yǔ)動(dòng)詞作狀語(yǔ)的用法。根據(jù)主句主語(yǔ)he和動(dòng)詞realize之間的邏輯關(guān)系，此處應(yīng)該表示主動(dòng)，故可先排除A、C兩個(gè)表示被動(dòng)的選項(xiàng)。B項(xiàng)表示目的，和語(yǔ)境及句子意思不相符。

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