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
I was about to inform you of the sudden change ______an unexpected visitor came.
#30562
A
because
B
before
C
when
D
unless
________ many countries in Latin America have been trying to reduce gaps in income, America has allowed inequality to grow.
#32960
A
While
B
Since
C
If
D
Where
It's important to learn how the whole system works. Sometimes, ________， it's the details that interest us the most.
#32141
A
therefore
B
meanwhile
C
furthermore
D
though
I’m sorry you’ve been waiting so long,but it’ll still be some time_____Tom gets back.
#30381
A
when
B
before
C
after
D
since