问题
单项选择题
More than 30 years ago, （）that the region was rich in natural resources。
A.people did littleknow
B.people little know
C.littledidknow
D.little did people know
答案
参考答案：D
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More than 30 years ago, （）that the region was rich in natural resources。
A.people did littleknow
B.people little know
C.littledidknow
D.little did people know
参考答案：D