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

A. once they grew  B. they grew once 

C. they once grew  D. once grew

C


解析:

C。先行詞是 those，可視為 those flowers 之省略。they once grew 前省略了關(guān)系代詞 which。全句意為：這兒所養(yǎng)的花是由他們?cè)谏掷锓N植的花培養(yǎng)出來(lái)的。

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