When flint _____________ to the market, these products enjoyed great success.

A. introducing                         B.introduced

C. introduce                            D.being introduced

 

答案:B
解析:

該題的題意為:當燧石被引入市場后,這些產(chǎn)品獲得了極大成功。該題考查過去分詞短語作狀語代替狀語從句的情況。注意的是過去分詞introduced的邏輯主語(flint)和句子的主語(these products) 并不一致,因此判斷分詞的時態(tài)和語態(tài)時應(yīng)特別注意。

 


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