1. Companies that are targeting this niche have found taht products that
simply do the job for ___ they were designed are easier to manufacture,
required less.....
(A) what (B) where (C) which (D) whom
疑问： 答案是C, 为什么不是A呢?
2. Yet, despite all the advertising for these more advanced models, sales of
cell phones that____ can be used to make and receive calls remain high.
(A) highly (B) necessarily (C) only (D) partially
疑问： 答案C，为什么不是A呢? 另外这题翻译该怎么翻? 请问是什么意思?
3. With only a few days left until the presidental election, analysts are now
debating ____ candidate is favored to win.
(A) about (B) on (C) which (D) whom
疑问： 答案C，为什么不是B呢? 因为我看过有debate on 的用法....
拜托各位了! 翻过文法书还是不懂...