Existing low gas mileage vehicles will be______phased out over the next five years until transition to more fuel efficient new m

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问题 Existing low gas mileage vehicles will be______phased out over the next five years until transition to more fuel efficient new models is complete.

选项 A、accidentally
B、gradually
C、extremely
D、occasionally

答案B

解析 词汇:副词1.这是一道词汇题,选项均为副词。2.原文意思是“逐渐淘汰”,因此(B)gradually为正确选项。
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