1B that and that
xA2D its可以指代 Saxton’s,it不行,另外closes多了个s
3C mistake A for B sound-blast合理
4D 主谓
5E try to do尝试做某事;另外前面among his constituents在后感觉好些,避免among his constituents and the stock market歧义
xD6B 原来B少了个by…..瞎了
7D test-test可比,前面是test cost 不是diseases cost
8C such as举例,主谓remains
9B 需要did
10E 平行
11D them/it无指代,to deal
XE12A 以为for在这里表原因,但是分句形式不对