书名：多益一路通
页数：修订版 第22刷
题目：p.264 第八题 第九题
疑问：
8. ____ the incorrect information, the computer will make a serious error.
(A) Feed
(B) Feeding
(C) Fed
(D) To feed
答案是C , 我选 B , 是因为没有该句子没有动词吗? 那为什么A是错误?
9. When _____ to present his driver's license, the young man took off and
left the police officer behind.
(A) asked
(B) asking
(C) has asked
(D) did he ask
答案 A 我选C 是因为没有主词所以不能选C吗?
我文法很弱，劳烦各位前辈解说 谢谢