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

  A. once they grew             B. they grew once 

  C. that once grew              D. once grew

C


解析:

考查定語(yǔ)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(yǔ)從句，those相當(dāng)于those flowers，是先行詞，因?yàn)槭巧L(zhǎng)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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