The medical profession is not in agreement about how to treat snakebites; physicians are unsure about how much antiserum to use, and there is controversy over the relative merits of surgery and antivenins.
(B) not sure how much antiserum they should use and have a controversy about
(C) unsure how much antiserum they should use, and they have controversy about
(D) not sure as to how much antiserum they should be using, and there is a controversy over
(E) unsure about how much antiserum should be used, and they have a controversy as to what is
答案是(A)
請問一下,這題要怎麼解?