△点拨△
命题人通过添加插入语、限定语、定语从句、同位语等成分，无疑增加了句子的复杂程度，
造成学生的视觉差异，从而导致思维错位，产生误导。
解答这类题通常采用的方法是“删除法”，去掉多余信息(插入语、限定语等)，答案就显而易见了。
△训练△
得分：________
1. John plays football ________, if not better than, David.
A. as well B. as well as C. so well D. so well as
2. She opened the envelope， ________ the letter and began to read it.
A. unfolded B. folding C. unfolding D. folded
3. Mike，as far as I know， ________ like to play music.
A. seems B. appears C. feels D. does
4. It is in the city ________ you’re going to pay a visit to ________ this kind of beer is produced.
A.不填；that B. where；that C.不填；where D. that；which
5.—How long do you suppose it is ________ he arrived here？
—No more than half a week.
