【2014 甘肃白银】The zoo keeper is worried because the number of visitors _______ smaller and smaller.
| A．become | B．are becoming |
| C．is becoming | D．have become |
【2014 甘肃白银】The zoo keeper is worried because the number of visitors _______ smaller and smaller.
| A．become | B．are becoming |
| C．is becoming | D．have become |
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