Scientists are now working ______ humanoids.Because they can

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Scientists are now working ______ humanoids.Because they can help people a lot.
Scientists are now working ______
humanoids.Because they can help people a lot.
A.on B.against C.into D.to

" Scientists are now working _on_ humanoids.Because they can help people a lot."
科学家们现在正在致力于类人机器人.因为它们能够帮助人们许多.
work on 从事于.致力于.
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Scientists are now working ______ humanoids.Because they can Scientists are spending as much as they can ______(study) th I can't help you now ,because I'm working . 帮我填空:1.They are _ working now. Fish are vertebrates because they have ______. They are working ______(energy)to reduce waste. The companies are working together to create ______ they hop They are working. They are working They are hard-working. Now the workers are working I can't help you now,because I'm working.（改为同义句）I can't help