单项选择题
A.is due to B.dues to C.is because D.is for
An engineer, together with some motormen （）to help in t...
单项选择题An engineer, together with some motormen （）to help in the repair work.
A.send B.sends C.was sent D.were sent
If there are （） in the repair work, please come to our ...
单项选择题If there are （） in the repair work, please come to our duty engineer at once.
A.any problem B.some problem C.any problems D.some problems
If the surveyors （）yesterday, they would have finished ...
单项选择题If the surveyors （）yesterday, they would have finished the survey work.
A.did not interrupt B.were not interrupted C.had not interrupted D.had not been interrupted
