There’s no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.
#31181
A
since
B
if
C
as
D
while
推荐题目
“Drive-ins” have large parking lots _______ customers are served in their cars by waitresses．
#32714
A
who
B
when
C
which
D
where
________ you are supposed to do ________ you don't like a thing is change it. Don't complain.
#30078
A
That; why
B
What; when
C
What; where
D
That; how
—How long will it be ________ the 30th Olympic Games is held in London? —It won’t be two years, I think.
#32499
A
when
B
that
C
before
D
since
In some countries, some people don’t even have fresh water or basic health care, reaching the target will be difficult , help from the international community.
#32113
A
where; despite
B
that ; though
C
where; although
D
which; despite
Help others whenever you can _______ you will make the world a nicer place to live in.
#79807
A
and
B
or
C
unless
D
but