sat语法题帮我改

问题描述:

sat语法题帮我改
Each time Mary turns on her computer,she has (A) to enter a company code,then her initials,and then enters a password (B) before (C) she can begin working (D).怎么改?

应该将B中enters去掉
可以发现本句结构如下
she has to enter (A,B ,and C) 这些A(a company code) B(her initials) C (a password )是并列一致的,所以D 的enters多余了,破坏了平行结构,应当去掉