题目内容：

2.The population of many Alaskan cities has __doubled in the past five years.
A.larger than B.more than C.as greatly as D.as much as

优质解答

B has doubled 是现在完成时态.more than 相当于over,“多于,超出”的意思.这句话是说“在过去的五年里,许多阿拉斯加州城市的人口增加了一倍多”.