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

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

出自：大学英语B2252

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