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Many periods happened in history when remarkable progress was made within a rela
Many periods happened in history when remarkable progress was made within a rela
游客
2025-01-20
20
管理
问题
Many periods happened
in history when remarkable progress was made within a relatively short span of time.
选项
A、Periods have been
B、Many periods were
C、There have been periods
D、Throughout periods there were
答案
C
解析
本题重点考查分隔式定语从句。画线部分不是规范的英语表达,更像中式英语。period一般不与动词happen搭配使用。这是一个主从复合句,when引导的定语从句修饰periods,从句中用了过去时,而主句表示历史上有许多这样的时期,包含从过去到说话人说话时为止,应该用现在完成时,所以只有A和C选项可选。但A选项作为主句部分语义不完整,故选C。C选项是there be句型。
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