John waited at the bus-stop for nearly half an hour _____ the bus finally arrived .
#80108
A
when
B
as
C
before
D
while
推荐题目
_____ basic first-aid techniques will help you respond quickly to emergencies.
#31190
A
Known
B
Having known
C
Knowing
D
Being known
A ban is called for by the residents __________ people shouldn’t walk dogs in that square．
#30198
A
what
B
whether
C
why
D
that
---- Our holiday cost a lot of money.---- Did it ? Well, that doesn’t matter_______ you enjoyed yourself.
#31062
A
as long as
B
unless
C
as soon as
D
though
She is very dear to us. We have been prepared to do ______ it takes to save her life.
#80597
A
whichever
B
however
C
whatever
D
whoever
_____ the Internet brings much profit in, it can cause o lot of social problem.
#80454
A
If
B
While
C
Once
D
When