Improve Sentencces Question
I am confused trying to understand this one.
Although the senator has been involved in unethical behavior, her constituents continue to show strong support for her.
(A) has been involved
(C) being involved
(D) has yet to be involved
(E) is involving
I thought the answer should be B but the book says it's A. Can anyone explain why it is A? I am not clear about has, have, had, can, could, may, might, shall, and should. I will be glad if someone can clear them up. Thanks.