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16、Due to the desertification,huge quantities of soil _____each year.

A.is washing,away                                   B.is being washed away

C.are washing away                                      D.are being washed away

16、D

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Due to the desertification,huge quantities of soil _____each year.

A.is washing,away                                   B.is being washed away

C.are washing away                                      D.are being washed away

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