_____ a certain doubt among the workers as to whether he could finish the task in a short time．
#34562
A
It was
B
There had
C
There existed
D
It had
推荐题目
________ he stops driving himself like this, he'll have a breakdown.
#30254
A
Until
B
Once
C
Since
D
Unless
_________ going to the exhibition.
#34752
A
All but he and me is
B
All but he and me are
C
All but he and I are
D
All but he and I am
—How should I deal with new words in reading? —Well, you’d better not stop you come to a word or a phrase you don’t know.
#30833
A
one time
B
the time
C
every time
D
a time
When astronauts return to the earth’s atmosphere, helicopters fly to________they would land, ready to collect them.
#34720
A
what
B
where
C
which
D
that
“Follow sb’s advice ” means ____.
#80457
A
do as sb. does
B
say as sb. says
C
say as sb.does
D
do as sb.says