Each time Caroline turns on her computer, she has to enter a company code, then her initials, and then enters a password before she can begin working. No error.
读句子，发现这个女人工作之前要干3件事：enter a company code, enters her initials, enters a password，这3个动作构成了并列。题干已经有提示：she has to enter a company code, then (enters)her initials, 所以剩下来的enters毫无疑问也应该省略即改成and then(enters)a password before she can begin working
A talented and versatile artist, Twyla Tharp has been a dancer, choreographer, and collaborated on various productions. No error.
还是并列结构，改成has been a dancer, choreographer, and collaborator.这样的句子就很整洁了。写作的时候可以用上的。
{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','http://www-static.zhan.com/web/frontend/static/images/img627/logo_new.png', '推荐 Z 旧爱人 的问题《sat里的平行结构应该怎么写？》','//www.zhan.com/ask/q-11812.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}
平行并列结构。两个以上的分句并列时，一般美国人爱用并列结构，这样的好处是使文章看起来工整。
判断方法：出现多个并列成分;出现比如from…to…等类似的经典介词组合。注意：并列结构使SAT很喜欢考察的内容!
Each time Caroline turns on her computer, she has to enter a company code, then her initials, and then enters a password before she can begin working. No error.
读句子，发现这个女人工作之前要干3件事：enter a company code, enters her initials, enters a password，这3个动作构成了并列。题干已经有提示：she has to enter a company code, then (enters)her initials, 所以剩下来的enters毫无疑问也应该省略即改成and then(enters)a password before she can begin working
A talented and versatile artist, Twyla Tharp has been a dancer, choreographer, and collaborated on various productions. No error.
还是并列结构，改成has been a dancer, choreographer, and collaborator.这样的句子就很整洁了。写作的时候可以用上的。