1.The choreographer Katherine Dunham having trained as an anthropologist,she studied dance in Jamaica,Haiti,and Senegal.
Katherine Dunham,who was also a trained antropologist,studied
2. Weight training was begun by the girl to enhance her strength and flexibility.
The girl had begun the exercise of weight training to enhance
点评：搭配不当。因该是”begin exercise” 放入句中，用过去完成时。同时注意主语最好放在句首，一般勿倒装。
3.One of the most common types of mistakes that inexperienced drivers make is failing to signal for a lane change;another one that occurs about as frequently is exceeding posted speed limits.
点评：Right! 首先，检查主谓一致性，无误。由于前面是一个句子，后面也是一个句子，为避免Run-on，应用分好隔开(两句无因果关系)。同时注意”another” 和”another one”用法。
4. Although talent may be a crucial element on the road to fame,it is difficult to succeed without a highly developed work ethic.
without a highly developed work ethic,succeeding is difficult.
点评：目前不知道为何这样改，大家研究一下。但又数个同类型题都如此，经验就是形如 “Although…另一个东西也必要”后一定要按意思届一个“without”而不用“It is…”
5.(常考题：转折) Some taxpayers knowingly violate IRS regulations when filing their tax returnes,in other respects they are law-abiding citizens,however.
Some taxpayers who are otherwise obedient citizens knowingly violate IRS regulations in their tax returns.
6. Although my alarm clock did not go off,causing me to arrive no more than ten minutes late.
it did not cause me to arrive more