Tourism, _______ it brings in money to a country, can also result in damage to the World Heritage sites there.
#30698
A
once
B
while
C
if
D
as
推荐题目
In the office an electrical engineer is looking through the instructions to know ________ the heat system works before the repair work.
#30344
A
whether
B
why
C
how
D
that
It was difficult to tell exactly _______ the saying began, but it is possible that it was in the theatre or movie industry.
#31061
A
where
B
when
C
why
D
that
________ is quite natural,a beginner can't read the books written in English very quickly.
#80332
A
Which
B
As
C
What
D
It
It was quite a few years __________the accused was declared innocent and set free.
#34716
A
since
B
that
C
when
D
before
The head of the company promised to deal with matters of this sort _____he returned to his office．
#32768
A
until
B
while
C
by the time
D
the moment