2. 外语
  3. The number of primary schools in the rural areas______doubling in the past 50 years.

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

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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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