Although they plant trees in this area every year, the tops of some hills are still ______.
(A)blank
(B)hollow
(C)vacant
(D)bare
出自：郑州工程技术学院-大学英语1
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Although they plant trees in this area every year, the tops of some hills are still ______.
(A)blank
(B)hollow
(C)vacant
(D)bare
出自：郑州工程技术学院-大学英语1