SAT语法问题.鄙人要出国,但英语不理想,要求：请解释我的错误选项以及正解.对于修改病句,务必改正错误.最好可以用正解造

SAT语法问题.
鄙人要出国,但英语不理想,
要求：
请解释我的错误选项以及正解.对于修改病句,务必改正错误.最好可以用正解造个句子或举个例子.
括号为修改部分或选项
1.The annual National Concrete Competition attracts teams of engineering students （having designed）canoes that promote the versatility of concrete.
A.having designed
B.who have designed
C.for designing
D.to be designing
E.and they designed
我选D.
从Annual可以看出句子是 present tense,但是答案B怎么是past tense?
2.Reading stories aloud to young students is an effective way to help them learn new words,(also it can spark their interest in studying) literature.
A.as it is
B.words,and it can also spark their interest in studying
C.words that can also spark in them the interest to study
D.words,as well as it could spark their interest in studying
我选A.
Also不是conjunction,可以连接两个句子吗?而且B也没有体现出“也”这个意思.
题目3-8为修改病句
3.Because traffic was (unusually heavy),Jim arrived ten minutes late (for) his job interview even though he had (ran desperately) all the way (from) the bus stop.(No error)
我选了E no error.
过去完成时不是had done sth吗,哪里错了?
4.(As) adults,male golden silk spiders (live not) in webs of (their own) making but rather in webs (made) by female spiders.No error
我选A.
As不是“作为”的意思吗,它这么说不是相当于说有的male spiders都是adults吗?
5.At a time (when) interest in 20th century classical music (seems) on the verge (to disappear),the avant-garde compositions of the 1960s and the 1970s (manage) to retain their popularity.No error
我选D.
它明明说at a time,说明是过去发生的,但为什么选项B和D都是现在时?
6.Persistent use of antibacterial soaps in homes (both kills) (many innocuous) bacteria and (encourages) harmful ones to develop (even more resistant) strains.No error
我选A.
把both放在kill的前面不是说有两个主语会杀死细菌吗?比如说Me and Tom both like coffee.而句子想表达的不是这个意思
7.(Opposite to) most people I know,Annie,a good photographer (herself),actually (enjoys seeing) the photograph that her friends take (on their) vacations.No error
我选E.
8.(At) the reception (were) the (chattering) guests,the three-tiered cake,and the lively music that have become (characteristic) of many wedding celebrations.No error
我选D.
为什么不是characteristics of复数形式?
B选项我多打了个also，应该是words，and it can spark their interest in studying.A选项as it is是指照搬原文，而不是要你真的填as it is。