comuputers are the second most useful ______ in the world .A invention B inventions.请问,选哪一个?高手指教为盼.在此谢过!

comuputers are the second most useful ______ in the world .A invention B inventions.请问,选哪一个?高手指教为盼.在此谢过!
comuputers are the second most useful ______ in the world .A invention B inventions.请问,选哪一个?高手指教为盼.在此谢过!

comuputers are the second most useful ______ in the world .A invention B inventions.请问,选哪一个?高手指教为盼.在此谢过!
a

A invention

comuputers are the second most useful ______ in the world .
The answer should be A, for "computers" here refers to a type of somthing, and "the second" is the other reason.

我想答案错了

选B，这里的inventions 应该和前面的computers 相对，既然前面是复数，后面的inventions也必须是复数。你可以这样翻译：电脑【们】是世上第二有用的发明【们】