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The permanence of dams have already constructed must be ensured, by carrying out
The permanence of dams have already constructed must be ensured, by carrying out
游客
2023-12-31
21
管理
问题
The permanence of dams
have already constructed must be ensured
, by carrying out whatever can be done to stop erosion.
选项
A、has already been constructed be ensured
B、already being constructed must be ensured
C、already constructed must be ensured
D、must be ensured constructed
答案
C
解析
(1)画线部分错误分析。
下画线处错误在于有两套限定动词作谓语,而一个句子只能有一套限定动词。当一个句子中出现两个动词时,必须有主次之分:次要的信息以非谓语动词的形式出现。
本题中ensure为主要动词,construct为次要动词所以应以非谓语形式出现,它的形式取决于其逻辑主语dams,因此用constructed表示被动关系。
(2)选项分析。
综上所述,A选项与画线部分属于同一种错误,有两套限定动词作谓语,所以排除A;根据句意“已经建造好的大坝”,B选项使用现在分词不符合题意;C选项用动词过去分词作后置定语,句子谓语为must be ensured,句子完整且正确;D选项中ensure和construct连用,语法错误,故排除D。因此本题正确答案是C。
【知识拓展】语法拓展:过去分词的用法。
①作表语:过去分词作表语时,一般同时具备被动与完成的含义。
e.g.The cup is now broken.
茶杯碎了。
②作定语:及物动词的过去分词作定语,既表被动又表完成;不及物动词的过去分词作定语,只表完成。
e.g.We must adapt our thinking to the changed conditions.
我们必须调整思想以适应情况的变化。
The concert given by their friends was a success.
他们的朋友举行的音乐会大为成功。
③作状语:多表示被动和完成两重含义。
e.g.Faced with difficulties,we shouldn’t withdraw for any excuse.
面对困难,我们不应该以任何理由退缩。
④作宾语补足语。
e.g.I heard the song sung in English.
我听到有人用英语唱过这首歌。
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