There is no way of knowing why one man makes an important discovery ______ another man, also intelligent, fails.
#30143
A
since
B
if
C
as
D
while
推荐题目
The heavy rain is so troublesome. _________ it would stop!
#33874
A
Only if
B
Even if
C
Ever since
D
If only
---Are you firmly against any independence move by Taiwan? ---Of course. That’s ______ our basic interest lies.
#30217
A
why
B
when
C
where
D
in which
Having checked the doors were closed, and ________ all the lights were off, the boy opened the door to his bedroom.
#29971
A
why
B
that
C
when
D
where
Doris’ success lies in the fact _______she is co-operative and eager to learn from others.
#30184
A
which
B
that
C
when
D
why
—I must apologize for ______ ahead of time. —That’s all right.
#32100
A
not letting you to know
B
not letting you know
C
letting you know not
D
letting not you know