(2010·上海)Wind power is an ancient source of energy ________ we may return in the near future.
#30491
A
on which
B
by which
C
to which
D
from which
推荐题目
______this difficulty is overcome, other problems will be easy to solve.
#33583
A
For
B
Whether
C
Once
D
Though
—- Can you tell me how to improve my spoken Enlish ? —- Do more speaking ,I think ,______ you will do better in it .
#33025
A
and
B
or
C
so
D
but
Yang Liwei was surrounded by the audience _____ he stepped off the stage.
#32766
A
until
B
through
C
now that
D
instantly
When the students heard the alarm, they all hurried to they thought was an emergency exit door．
#30175
A
what
B
which
C
where
D
who