单项选择题

I was (so interested in) the video that I (watched) it (for) two hours before I (realized) it.

A．so interested in
B．watched
C．for
D．realized
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单项选择题
The most (distinctive) change in American (values) of the last twenty years (has been) an increasing emphasis (in) the pursuit of self-fulfillment.
A．distinctive
B．values
C．has been
D．in
单项选择题
______ being fun and good exercise, swimming is a very useful skill.
A．Rather than
B．Apart from
C．Instead of
D．Owing to
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