单项选择题
A.in B.to C.from D.by
The second engineer seemed to know what the sign （）.A.s...
单项选择题The second engineer seemed to know what the sign （）.
A.stand by B.stand for C.stood by D.stood for
We have just repaired the motorRemember （） to it during...
单项选择题We have just repaired the motorRemember （） to it during your watch.
A.to pay attention B.paying attention C.pay attention D.your paying attention
Rounds （）Everything is in good order.A.operatedB.madeC....
单项选择题Rounds （）Everything is in good order.
A.operated B.made C.run D.done
