It has been estimated that only 21 percent of______world’s land surface can be cultivated and that only 7.6 percent is actually

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问题 It has been estimated that only 21 percent of______world’s land surface can be cultivated and that only 7.6 percent is actually under______cultivation.

选项 A、/.../
B、the...the
C、/...the
D、the.../

答案D

解析
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