Over the past decades, mountain ice______ in the Himalayas as a result of global warming．
| A．has been decreasing | B．had decreased |
| C．decreased | D．is decreasing |
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Over the past decades, mountain ice______ in the Himalayas as a result of global warming．
| A．has been decreasing | B．had decreased |
| C．decreased | D．is decreasing |
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