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题库 / OG2018V-SC-267
Kudzu, an Asian vine that has grown rampantly in the southern United States since introducing it in the 1920s to thwart soil erosion, has overrun many houses and countless acres of roadside.
that has grown rampantly in the southern United States since introducing it in the 1920s to thwart
that has grown rampantly in the southern United States, since it was introduced in the 1920s for thwarting
that has grown rampant in the southern United States since it was introduced in the 1920s to thwart
growing rampant in the southern United States since introducing it in the 1920s for thwarting
growing rampantly in the southern United States, since it was introduced in the 1920s to thwart
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①不带逗号的“since”表示时间起始点，带了逗号的“since”的功能变成了引导原因状语从句
②grow当 变得 讲 是系动词 后面加形容词 如：grow older
③since出现尽量体现出完成时态
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