26. Only when she looked up from her desk, ______ find that it was very dark.
(A) can she
(B) she did
(C) did she
(D) she can

答案：登入後查看
統計： A(21), B(21), C(105), D(7), E(0) #217436

詳解 (共 2 筆)

#7307132

為什麼不能有逗號？

當 Only + 副詞子句 放在句首時：

  • 它是整句的一部分

  • 不能用逗號把主句分開

  • 主句必須倒裝（助動詞提前）

結構是：

Only when + 子句 + 倒裝主句

? 不是兩個獨立句，所以不加逗號。

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#6002396

倒裝句 Only when she looked up from her desk did she find that it was very dark.
原本是 She found that her desk was very dark only when she looked up from it. 

如果句子中出現 only when/ if ，並且後面接「子句」或 only 後面接「介系詞片語」，只要將「only when/ if」跟「後面的子句」或是 「only」 跟後面的「介系詞片語」移到句首，再把「主詞」跟「Be 動詞或助動詞」交換就完成。其他例句:
I take the MRT to work only when it rains.
→ Only when it rains do I take the MRT to work.
（我只有在下雨時會搭捷運上班。）

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