24. _____ on a clear day, far from the city crowds, the mountains give him a sense of infinite peace.
A. If walking
B. While walking
C. Walking
D. When one is walking
查看答案
25. So little _____ about mathematics that the lecture was completely beyond me.
A. I know
B. I knew
C. do I know
D. did I know
26. It was not long _____ the news spread and people from all over the world came to visit this miracle of nature.
A. after
B. before
C. until
D. when
27. No sooner had we reached the top of the hill _____ we all sat down to rest.
A. when
B. then
C. than
D. until
28. San Francisco is usually cool in the summer, but Los Angeles _____ .
A. is rarely
B. rarely is
C. hardly is
D. is scarcely