More and more people have realized that we won’t have cleaner water to drink unless something _______soon.
#44577
A
is done
B
was done
C
will be done
D
to be done
推荐题目
 The 30th London Olympic Games ____________ on July 27th, 2012.
#44703
A
will be held
B
is held
C
was held    
D
has been held
The children ______ not to play with the fire.
#45047
A
are often told 
B
tell 
C
are telling 
D
told
The monkey was seen _________off the tall tree.
#44572
A
jump
B
jumps
C
jumped
D
to jump