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不定式的语态的两道题 1.they are very busy now,they have lots of work _

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不定式的语态的两道题 1.they are very busy now,they have lots of work _____at once
A.do B.to do C.to be done D.be doing
2.we find it impossible for the work________ahead of time
A.to finish B.finishing C.being finished D.to be finished
第一个选B
第二个选D
不懂求思路
急
不定式的语态的两道题 1.they are very busy now,they have lots of work _
第一题 如果 没有 前面的句子 选项 B.to do 和 C.to be done 都是对的 只不过意思不一样
前者不定式 的逻辑主语 是句子主语 与不定式是主动关系 后者 不定式的逻辑主语 不是句子主语
因为前面说 他们很忙 所以 不定式 的逻辑主语 一定是 句子主语 因为是主动关系 故用不定式的主动形式
所以 答案是 B.to do
第二题是动词不定式 的复合结构 作真宾语
不定式的逻辑主语 是 the work 与不定式是被动关系 故用 不定式的被动形式
答案是 D.to be finished
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