书名：寂天挑战新多益1000题
页数：P6 112题
题目：
In 2009,Italian fashion designer Valentino Garavani announced his
retirement ______ 45 years in the fashion business.
(A) within
(B) on
(C) after
(D) along
答案是(C)
疑问：为什么不能选(A) within 45 years (在投入时尚界的45年内退休)
页数：P9 131题
题目：
　　　 _____ direct flights are available from Atlanta to Calgary
International Airport, although major airlines offer good connections
through Chicago, Denver or Houston.
(A) No
(B) Not
(C) None
(D) Never
疑问：答案是Ａ，为什么不能选Ｃ
页数：P12 145题
题目：This one-hour drive will give you a wonderful experience, passing
green rice fields on your way to the resort ______ some quaint villages,
which specialize in handmade craft.
(A) in addition
(B) beside
(C) as well as
(D) together
疑问：A跟C不是都是"除此之外"的意思?为什么答案是C而不能选A呢?!
麻烦了,谢谢大家