How the big forest fire has          remains to be a mystery.
#66249
A
turned up
B
broken out
C
taken place
D
broken up
推荐题目
I would prefer _______ a low-income job that I am interested in rather than _________ my interest. 
#64738
A
to do; abandon
B
doing; abandon
C
to do; to abandon
D
doing; to abandon
The lecture on how to enjoy pop music is really     worth_____.
#74826
A
very; listening
B
well; listening to
C
well; attending to
D
very; attending