2. 职称英语
  3. 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  12
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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