Although they plant trees in this area every year, the tops of some hills are still ______. 　　 (A)blank (B)hollow (C)vacant (D)bare

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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