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
It is uncertain ________ side effect the medicine will bring about, although about two thousand patients have taken it.(2010·浙江)
#29978
A
that
B
what
C
how
D
whether
______ the students found the soldier’s idea interesting, the system was too difficult to be of practical use.
#32332
A
While
B
Unless
C
As soon as
D
Even if
_______ you’ve got a chance, you might as well make full use of it.
#31771
A
Even though
B
In case
C
Now that
D
Only if
Dr. Black comes from either Oxford or Cambridge. I can’t remember _____.
#30800
A
who
B
there
C
which
D
what