____ 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
Leave your key with a neighbor _______ you lock your-self out one day.
#79809
A
ever since
B
even if
C
soon after
D
in case
An independent traveler would like to struggle with maps and signs ____ he finds the way．
#31222
A
since
B
until
C
before
D
when
______much pressure the U.S. government put on the Chinese government, China would stick to its own policy of exchange rate.
#32979
A
However
B
Wherever
C
Whatever
D
Whoever