17．Although they plant trees in this area every year, the tops of some hills are still ． A．——青夏教育精英家教网—

摘要：17．Although they plant trees in this area every year, the tops of some hills are still ． A．blank B．bare C．solid D．rare

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Although they plant trees in this area every year, the tops of some hills are still ________．

blank

bare

solid

rare

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