[单选题]One-third of the area _____ covered with green trees. About seventy percent of the trees _____ been planted.
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2023-10-02 10:11:58
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[单选题]One-third of the area _____ covered with green trees. About seventy percent of the trees _____ been planted.
A.are; have
B.is; has
C.is; have
D.are; has
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