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With more forests destroyed, huge quantities of good earth _____ for the past few decades.

A. is washing away
B. has been washed away
C. are washed away
D. have been washed away
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科目：高中英語 來源：0111 月考題 題型：單選題

With more forests destroyed, huge quantities of good earth _____ for the past few decades.
[     ]
A. is washing away
B. has been washed away
C. are washed away
D. have been washed away

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