—Hello, can I speak to Mr. Smith?—I’m sorry, but it is 3 weeks _____ he worked here.
#31785
A
before
B
since
C
after
D
while
推荐题目
From time to time a crocodile has snatched someone _______ he or she is even aware that the crocodile is there.
#33837
A
when
B
until
C
since
D
before
she tells him the truth now, he’ll simply keep on asking her until she does.
#33068
A
Unless
B
Once
C
If
D
Immediately
_______ many people first go to the Internet for information, it is not always the best place for what you need.
#33612
A
As
B
Since
C
When
D
While