nakib77 wrote:
Researchers have explored the possibility that dolphins are able to be trained to communicate as humans.
A) are able to be trained to communicate as humans
B) were able to be trained to communicate as humans
C) can be trained to communicate like humans can
D) could be trained to communicate as humans
E) are capable of being trained to communicate as humans do
Comparison is done here, hence 'as' is correct but it needs a clause and 'E' is the only option that fulfils the requirement.
...
![VA – DVD-Audio Music Sampler Vol.2 (2003) [DVD-Audio ISO]](http://imghd.xyz/images/2026/05/13/4lSo1rN.jpg)
