Answer:
but much research has been done and more has learned about brain injuries in the last 5 years
Explanation:
because this shows they are telling more players about the injuries and informing them about the dangers of playing
I had to look for the missing passage and the options and here is the answer:"Here is New York" is a book that was written by E. B. White and Roger Angell. And based on the passage taken from this book, the effect that the symbol has on the meaning on this passage is this: The commuter is the queerest bird of all. The suburb he inhabits has no essential vitality of its own and is a mere roost where he comes at day’s end to go to sleep. (This answer is based on the actual options attached to this question).
When could is used it refers to an ability that <span>a person generally had in the past or to something that was generally possible in the past, can is present.
I could wash the dishes for you. (having the ability to do it)
I can wash the dishes for you. (its actually going to be done)
hope this helps you! :-)</span>
