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
请说明理由
所有回答(1)
选C。这句话可以缩为：all of the flowers have developed from those in the forest. 其中now raised here是修饰flowers的定语，those指花，后面应该填选项中的C，是that引导的定语从句。这句话的意思就是：所有这些现在在这开放的花儿是那些曾经生长在树林中的。
