Teenagers have done everything they can____ think of to deal with the problem.每空一词

Teenagers have done everything they can____ think of to deal with the problem.每空一词 get sth done和have sth done有什么区别?Teenagers shouldn’t be allowed to （） their ears piercedA get B have teenagers Could have done would have done should have done Many teenagers have an u____ diet. Many teenagers have hobbies.课文翻译 为什么''teenagers have too much freedom''? must have been done must have done have done与have be done would have done,might have done,could have done,should have done分别表示什么意思? may have done和may have done 的区别RTmay have done和might have done should have done ,shouldn't have done.could have done,couldn't have done have+done是什么时态? have sth done意思 we have done our 情态动词+have done what have u done could never have done