高中英语单选题 急

高中英语单选题 急
3. _______ is a good firm of exercise for both young and old.
A. The walkB. Walking C. To walkD. Walk
5. He asked me ______ with me. A. what the matter is
B. what the matter was C. what’s the matter D. what was the matter9. –Sorry to have kept you waiting.–_______ .
A. It’s all right. B. It doesn’t matterC. No worry. D. 12. He has some trouble ______ his classmates, but he has no trouble _______ doing his lessons.
A. with; withB. in; inC. with; in D. in; with
That’s right.
答案及详解
第3题 为什么不选C
第9 ABCD分别什么意思
第5 到底要用陈述语序还是疑问语序
第12 是固定搭配的用法吗