以下是引用merrymerry2006在2006-4-9 22:54:00的发言：2005-01-11 In North America, the Nebraska culture that succeeded the Woodland culture about A.D 1300 pioneered in to become the area's chief economic activity, agriculture. A it was B which was C what was D was 答案怎么会是C呢?
the main sentence is: the Nebraska culture pioneered in _____ to become the area's chief economic activity, agriculture.
we can see that we need a noun or a noun clause in the blank. Thus, only C is possible. | 
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发表于 2006-4-9 22:54:00
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