They were surprised that a four-year-old boy should work out such a difficult problem ____ they themselves couldn’t.
#80212
A
once
B
then
C
while
D
if
推荐题目
Between the two generations, it is often not their age, _________ their education that causes misunderstanding.
#79816
A
like
B
as
C
or
D
but
Qian Xuesen tried many times _________ he found the solution to the puzzle about space technology.
#31596
A
after
B
before
C
since
D
when
We have realized ________ she is expecting is just an opportunity to test her ability.
#30339
A
that
B
which
C
what
D
where
The director thought I was referring to her, in fact, I was referring to the men on duty.
#33052
A
when
B
where
C
which
D
while