单项选择题

After______ seemed an endless night, it was time for them to open the boxes of presents.

A．it
B．that
C．what
D．there
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问答题
The pressure ______causes Americans to be energetic, but it also puts them under a constant emotional strain.
单项选择题
Since it is too late to change my mind now, I am______ to carrying out the plan.
A．obliged
B．committed
C．engaged
D．resolved
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