_______ his return from America, he got down to his research.
#92169
A
While
B
In
C
As
D
On
推荐题目
Only when I left my parents for America ____ how much I loved them.
#93363
A
I realized
B
I had realized
C
had I realized
D
did I realize
With the development of science and technology，there is no doubt ________ Chinese astronauts will land on the moon in the near future.
#92552
A
whether
B
that
C
what
D
which
As we grow up, it always _______ that after we give something up, we gain something new in its place.
#92387
A
suggests
B
promises
C
requires
D
seems
John said he had been working in the office for an hour, _______ was true.
#94927
A
he
B
this
C
which
D
who