题目内容

One Chinese dynasty lasted more than 800 years______ another lasted only fifteen years.

A. when
B. while

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Rulers of the Qin dynasty managed to unify China and ______ the Age of Warring States by 221BCE..

A. ended
B. ending

All this makes for dangerous______.

A. stability
B. instability

What Banks don't want is ______.

A. to standardize
B. standardize

She was forced to abdicate the throne of Spain.

A. forced
B. was forced