英语改错问题eachtimeCarolineturnsonhercomputer,shetoenteracompanycode,thenherinitials,andthenshecan

Question

英语改错问题
each time Caroline turns on her computer,she to enter a company code,then her initials,and then she can< begin working>.
答案说第二个括号是错的,但我不知道为什么
Delgado's dilemma was young writers:he between assured publication in a student magazine a popular magazine
答案是第一个错的.我也不理解.
air polution caused by industrial fumes< has been studied> for years,< but> only recently the harmful effects of noise pollution known.
答案是第三个.不理解.抱歉
抱歉。关于第一个。我要是修正它的话。我该写成“TO ENTER”还是就“ENTER”？

Answer 1

1.第二个括号中的动词“enter “应该与前面的“enter”一致,也就是说也应该是“enter”,而不是“enters”——所以应该是.and then enter a password before.
2,Delgado's dilemma was young writers:主语是dliemma所以后面应该是< like many other young writers‘,是young writers的文凭.
3.后半句是一个倒装句,“become known”的是“the harmful effects of noise pollution”,主语“effects”是 复数,所以用的应该是“have”而非“has”