He tried his best to solve the problem,     difficult it was.  
#66875
A
no matter what
B
whatever
C
however
D
how
推荐题目
She’s asked me_______ to build the church.
#74273
A
how long it was taken
B
how long it had taken
C
how much time did it take
D
how much time it was taken
We’ll go hiking if it_________ rain tomorrow.
#41325
A
won’t rain
B
isn’t going to rain
C
doestn’t rain
D
don’t rain