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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单项选择题
The pressure ______causes Americans to be energetic, but it also puts them under a constant emotional strain.
A．to compete
B．competing
C．to be competed
D．having competed
单项选择题
______, I must do another experiment.
A．Be it ever so late
B．It is ever so late
C．It be ever so late
D．So late it be ever
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