Every possible means ________, but the teacher as well as the students ________ found a solution to the problem yet. 
#102485
A
has been tried; hasn’t
B
has tried; haven’t
C
have tried; haven’t
D
have been tried; hasn’t
推荐题目
Our family       made up of six people, and all       music.
#103550
A
is ; love
B
are ; love
C
is ; loves
D
are ; loves
Great changes ______in his hometown in the last twenty years.
#100973
A
were taken place
B
have taken place
C
have been taken place
D
took place
The wet weather will continue tomorrow, when a cold front ______ to arrive.
#104956
A
is expected
B
is expecting
C
expects
D
will be expected