casualwalk 当前离线
高级会员
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?
ghfgss231 当前离线
中级会员
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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