I had been puzzled over the problem for over an hour without any result, all at once a solution flashed across my mind.
#33232
A
while
B
when
C
then
D
as
推荐题目
In the US they focus on creative thinking skills, _____ in China they only focus on theory．
#32741
A
since
B
when
C
while
D
now that
Many workers were organized to clear away remained of the World Trade Center.
#30115
A
those
B
that
C
what
D
where
Most volunteers are from universities, _________ it is not uncommon to see middle and primary school students too.
#30378
A
though
B
however
C
since
D
even if
--- John failed his final exam.-- I’m not surprised at the news at all. _______, he is never seen busy with his lessons.
#31414
A
Above all
B
In all
C
First of all
D
After all
He had his camera ready____ he saw something that would make a good picture.
#31491
A
even if
B
if only
C
in case
D
so that