单项选择题

It is human nature to think back to a Golden Age ______one's country was strong and respected.

A．when
B．provided
C．as
D．unless
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单项选择题
There was a terrible______ as they waited to hear the names of the victims in the shipwreck.
A．pressure
B．expectation
C．stimulus
D．tension
单项选择题
Jack was so______ in his reading that he didn't notice me entering his study.
A．concentrated
B．engaged
C．absorbed
D．tempted
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