Should I repeat an auxiliary verb like "was" after "and" for a passive tense?
Here's an example:
It was shipped to laboratory in maximum time of one hour and was frozen at –80°C.
Should I repeat an auxiliary verb like "was" after "and" for a passive tense?
Here's an example:
It was shipped to laboratory in maximum time of one hour and was frozen at –80°C.
The was shipped could easily be changed to shipped, they are both acceptable. The and was frozen at -80°C however should always have the was as without it, and froze at -80°C sounds more like a scientific observation of the freezing point than a statement of action.
It is perfectly fine to repeat "and" and "was", especially when they are this separated. If it was something more list-like, such as it was made, packed and shipped then in that situation, repeating "and was" sounds awkward. This is for the same reason repeating "and" in a list sounds awkward, though it is not necessarily wrong
Most of this is my opinion, this topic is kind of subjective. I am sure you could find something to this effect in a style guide, but I should be programing right now so I'm not going to go looking for one. ;)