The flowers now raised here have developed from those ___in the forestA.once they grewB.that once grew

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Theflowersnowraisedherehavedevelopedfromthose___intheforestA.oncetheygrewB.thatoncegrewTheflowersnow

The flowers now raised here have developed from those ___in the forestA.once they grewB.that once grew
The flowers now raised here have developed from those ___in the forest
A.once they grew
B.that once grew

The flowers now raised here have developed from those ___in the forestA.once they grewB.that once grew
once是曾经的意思 是个副词 A选项根本不通 不符合从句的结构 横线上少个代词做从句的主语 that就是花的同位语

that指代不可数名词和单数可数名词(如是复数,用those)。因为题目中已出现those指代all of the flowers,因此后面直接是once grew。希望你可以明白