He tried his best to solve the problem, _______difficult it was.
#68277
A
no matter
B
no matter how
C
whatever
D
although
推荐题目
The argument remains extremely heated ______ it is worthwhile for China to open its door to foreign cars.
#71839
A
that
B
which
C
if
D
whether
I saw a boy in the supermarket yesterday, reminded me of my good friend.
#68626
A
that
B
which
C
where
D
who
Sally worked late in the evening to finish her report ________ her boss could read it first next morning.
#74582
A
so that
B
because
C
before
D
or else
(2013·湖南，23)You must learn to consult your feelings and your reason________you reach any decision.
#67444
A
although
B
before
C
because
D
unless
My sister isn’t in. ________ she comes back, I’ll let her call you back.
#41346
A
While
B
Until
C
Before
D
When