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题库 / BiChu21-SC-107
Towing insurance provides protection against collision damage to your automobile while being attached, towed, or detached from a covered rental truck, or loaded onto, transported, or unloaded from a covered rental trailer.
while being attached, towed, or detached from a covered rental truck, or loaded onto, transported,
while you are attaching to, towing by, or detaching it from a covered rental truck or while it is loaded onto, transported,
when attached to, towed by, or detached from a covered rental truck or when it is loaded onto, transported by,
while you being attached to, towed by, or detached from a covered rental truck or loaded onto, transported by,
when being attached to, towed by, or detached from a covered rental truck or loaded, transported,
这里讲解得还不错, https://english.stackexchange.com/questions/557697/can-a-pronoun-be-dropped-in-a-list。
主要考察的是while...or的结构对称性。
我也认为这样是正确的：while you are attaching (it) to, towing (it) by, or detaching it from...or while it is loaded onto, transported (by)...
即使括号的2个it可以省略，transported后面的by应该是不能省的。
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