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
Have you ever seen any trees ________ leaves were black because of the polluted air?
#66808
A
whose
B
that
C
which
D
who
I like the book so much that I'll buy it, _______.
#67565
A
no matter how it may cost
B
how may it cost
C
how much may it cost
D
however much it may cost
Philips won 8 gold medals at the Beijing Olympic Games, __________astonished the world.
#68739
A
that
B
which
C
what
D
who
He transplanted the rare flowers to the botany garden_______it was the best time for them.
#72295
A
where
B
when
C
until
D
that