________we went to visit Professor Smith, he________his research work.
#31550
A
The first time; devoted to
B
Whenever; was concentrate on
C
For the first time; was busy with
D
Each time; was absorbed in
推荐题目
You can’t use my bike _____ you return it to me by the weekend.
#31644
A
if not
B
unless
C
because
D
though
(2014·河南豫北三校联考)________is well known to everyone，I should say，is that a man becomes learned by asking questions.
#30046
A
Who
B
It
C
As
D
What
News has spread ______Mr. Smith has two people over him in this department.
#32124
A
while
B
that
C
when
D
as