____ Helen’s knowledge and vocabulary expanded, she asked more and more questions.
#31493
A
When
B
While
C
As
D
Before
推荐题目
I think it’ll take at least another two months _______ the shopping center is completed.
#33938
A
until
B
before
C
when
D
as
______ we have enough evidence (证据), we can't win the case.
#30742
A
Once
B
As long as
C
Unless
D
Since
It’s quite common in Britain to say “Thank you” to the drivers __ people get off the bus.
#33878
A
after
B
since
C
until
D
when