[单项选择]I have no doubt（　）most of the students can pass the exam.
A. that
B. as
C. whether
D. although

[单项选择]I have no doubt ______ most of the students in our class can pass the final examination.
A. whether
B. although
C. that
D. as

[单项选择]I have no doubt ________ most of the students in our class can pass the final examination
A. that
B. as
C. weather
D. although

[单项选择]______ a certain doubt among the students as to the necessity of the work.
A. There existed
B. They had
C. There had
D. It existed

[单项选择]

Drivers on the Basingstoke by-pass used to have their attention diverted (转移) by a sign that read: A MOMENT’S INATTENTION CAUSES ACCIDENTS. This self-defeating warning has now been removed, but its message is still very much to the point.
Almost anything can cause an accident, Apart from momentary inattention, it might be a minor miscalculation, a sudden cough, an argument with the wife, falling asleep at the wheel--all these make the difference between a tragic (悲剧的) hit and a lucky miss.
Although human error plays its part, it is by no means the only cause of accidents. There must be some cause other than simple human error. Road construction plays its part: re searchers have found that it is not at the obvious danger spots- sharp comers, cross-roads, nar row lanes--that accidents happen. It is on those roads where there are subtle (细微的) visual traps, unexpected changes in the shape or surface of the road, or even insufficient or badly placed
A. When he has been injured by somebody.
B. When his car has been damaged.
C. When he has injured somebody else.
D. When he has witnessed the accident.