There’s no way of knowing why one man makes an important discovery another man, also intelligent, fails.
#39533
A
since
B
If
C
as
D
while
推荐题目
— How do you often go to work?—I ________ go to work by bus, but now on foot.
#42361
A
used to
B
am used to
C
am used for
D
use to
— _______ do you use the Internet ? —Twice a week.
#42470
A
How often
B
How soon
C
How long
D
How Many times
We have been friends for nearly twenty years. Nothing can break off our _______.
#43982
A
friendship
B
pleasure
C
decision
D
experience