As we all know, the number of Tibetan antelopes(藏羚羊) ________ becoming ___________.
| A．is; less and less | B．are; less and less |
| C．is; smaller and smaller | D．are; smaller and smaller |
As we all know, the number of Tibetan antelopes(藏羚羊) ________ becoming ___________.
| A．is; less and less | B．are; less and less |
| C．is; smaller and smaller | D．are; smaller and smaller |
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