Before 8,000 B.C wheat did not grow as prolifically ______ it does today.

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问题 Before 8,000 B.C wheat did not grow as prolifically ______ it does today.

选项 A、like
B、as
C、for
D、than

答案B

解析 “as…as…”结构可以引导比较状语从句,该结构中的第一个as是副词(在否定句中,也可用 so替代as),后跟形容词或副词,第二个as是连词,后跟状语从句,从句中常有省略现象,另外还必须注意比较对象在概念上应一致,如:Electromagnetic waves travel as fast as light.电磁波和光的传播速度一样快。
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