单项选择题

The population of many Alaskan cities has ____ doubled in the past three years.

A．larger than
B．as great as
C．more than
D．as many as
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If it ____ too much trouble, I'd love a cup of tea.
A．isn't
B．wasn't
C．weren't
D．hadn't been
单项选择题
Urban mothers had difficulty ____ their children into child care facilities.
A．get
B．to get
C．in getting
D．for getting
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