单项选择题
When we arrived here yesterday, their ship （）for three days.
A.has left B.had left C.has been away D.had been away
单项选择题 The accident resulted （） the motorman’s carelessness.
单项选择题 The second engineer seemed to know what the sign （）.
单项选择题 We have just repaired the motorRemember （） to it during your watch.
