问题描述：
单选lf the land in that district
____ lf the land in that district ____ covered with trees and grass.
A Two-fifth;is
B Two-fifth;are
C Two-fifths;is
D Two-fifths;are
为什么?
____ lf the land in that district ____ covered with trees and grass.
A Two-fifth;is
B Two-fifth;are
C Two-fifths;is
D Two-fifths;are
为什么?
问题解答：
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