The number of primary schools in the rural areas______doubling in the past 50 ye

游客2025-02-28 6

问题 The number of primary schools in the rural areas______doubling in the past 50 years.

选项 A、are
B、is
C、have been
D、has been

答案 D

解析本题考查主谓一致与时态。The number of“……的数量”，其谓语动词用单数形式；in the past 50 years“在过去的50年内”，动词应使用完成时态，且这种动作很有可能会持续下去，应用现在完成时。故选D。

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