(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
It is said that by 2010 there will be ______530 million tourists entering Tibet each year.
#31848
A
as many as
B
as much as
C
as more as
D
many than
_The work is easy for an expert _______it is difficult for an inexperienced person.
#80051
A
because
B
therefore
C
while
D
unless
All the guests at the party were dancing and singing happily _____ the electricity was cut off.
#30392
A
until
B
while
C
when
D
because
The important task will take Peter and me about four months to complete, so it will be a long time _____ we meet you again.
#32890
A
after
B
when
C
since
D
before