单项选择题

One of the workers (has) (hung) the curtains that (had) been (laying) on the floor.

A．has
B．hung
C．had
D．laying
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单项选择题
I ______ with all the windows closed, but now I'd like some fresh air.
A．am used to sleep
B．am used to sleeping
C．used to sleeping
D．used to sleep
单项选择题
Americans eat ______ vegetables per person today as they did in 1910.
A．more than twice
B．as twice as many
C．twice as many as
D．more than twice as many
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