One-third of the area _____ covered with trees. About seventy percent of the trees _____ been planted recently.
| A．is; have | B．is; has |
| C．are; have | D．are; has |
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One-third of the area _____ covered with trees. About seventy percent of the trees _____ been planted recently.
| A．is; have | B．is; has |
| C．are; have | D．are; has |
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