In such hot weather the crops will have to be watered if they                  .
#72118
A
have survived
B
are to survive
C
would survive
D
will survive
推荐题目
I have two grammars, ______are of great use. 
#73806
A
all of which
B
either of which
C
both of that
D
both of which
Many experts agree that there is a possibility___ in this area in the following days.
#69074
A
when some more earthquakes may happen
B
that some more earthquakes may happen
C
where may some more earthquakes happen
D
what may some more earthquakes happen
This is the only one of the books on space ___.
#71605
A
that has been written
B
that have been written
C
which have been written
D
which has been written