All of the flowers now raised here have developed from those _____ in the forest.


  1. A.
    once they grew
  2. B.
    they grew once
  3. C.
    that once grew
  4. D.
    once grew
C
解析：
考查定語從句的關(guān)系詞的用法。分析句意和句子結(jié)構(gòu)可知those之后是個(gè)定語從句，those相當(dāng)于those flowers，是先行詞，因?yàn)槭巧L在森林里的（野）花，grew和關(guān)系代詞之間是主謂關(guān)系，因此that不能省。once在此表示“過去曾”，常與過去時(shí)連用，還可表示“每次”，引導(dǎo)從句時(shí)表示條件，翻譯成“一旦”。
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