Not for a moment ______ that this disease was caused by certain virus.
#81548
A
he have doubted
B
he doubts
C
did he doubt
D
he did doubt
推荐题目
When ____ to compare the education system of China and Britain, the professor gave no answer．
#81142
A
ask
B
asking
C
asked
D
to ask
It was many years ____ American women were given the rights to vote.
#81514
A
when
B
since
C
before
D
as
Though ______in a big city, Peter always prefers to paint the beautiful scenes of country life.
#80355
A
raised
B
was raised
C
raising
D
raises
When ________ different cultures，we often pay attention only to the differences .
#80311
A
compared
B
being compared
C
comparing
D
having compared