________ repeatedly, the problem still appeared in the beginners’ homework.

A.Explaining B.Having explained
C.Having been explainedD.To be explained

C

解析試題分析:考察分詞作狀語。本題中的動詞explain與后面句子主語the problem之間構(gòu)成被動關(guān)系,故使用過去分詞done表示被動,在很多情況下done="having" done;前者更多強調(diào)被動,后者更多強調(diào)已經(jīng)完成。句意:已經(jīng)被重復(fù)地多次解釋,這個問題還是出現(xiàn)在初學(xué)者的家庭作業(yè)里。故C正確。AB項沒有被動的形式,D項中的不定式表示的是將來時。
考點:考察分詞作狀語
點評:當(dāng)分詞做狀語的時候,如果構(gòu)成分詞的動詞與句子的主語構(gòu)成主動關(guān)系,就使用現(xiàn)在分詞做狀語;當(dāng)二者構(gòu)成被動關(guān)系,使用過去分詞做狀語。在很多情況下done="having" done;前者更多強調(diào)被動,后者更多強調(diào)已經(jīng)完成。如果分詞的動作發(fā)生在謂語動詞之前,就使用分詞的完成式。如果分詞與句子的主語沒有關(guān)系,可以使用狀語從句或者獨立主格結(jié)構(gòu)。

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