________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
He, an average citizen, always thinks of_____ he can do more for the people．
#31996
A
how
B
why
C
what
D
which
—____when has the country been open to international trade?—1978,I suppose.
#79800
A
Since
B
In
C
From
D
After
I have a tight budget for the trip, so I'm not going to fly _ the airlines lower ticket prices.
#31637
A
once
B
if
C
after
D
unless
______ some teenagers don’t realize is _______ difficult life can be after they get addicted to drugs．
#33803
A
What, how
B
That, how
C
What, what a
D
That, what
He said he would work it out himself, ________ ask nobody for help.
#79875
A
and not to
B
but not
C
and prefer not
D
rather than