Choose the correct sentence. a. the mechanic done his best, but it was an old car. b. the mechanic dones his best, but it was an old car. c. the mechanic did his

I mean I don't know the question but if it's what the correct grammar is it would be C.

I believe it’s C if your talking about grammar

There are many roles that differ for american exchange students. these include assimilating to the culture of the country that one is in, being able to learn the language and communicate with others, as well as being able to understand what is happening in the courses that are taken.