Boats in this area are ________ in order to keep the dolphins safe．

A.prohibited from entering

B.preventing from entering

C.stopped to enter

D.kept from entering into

答案及解析： A

本题考查了“禁止……做某事”的几个表达方法。prohibit…from doing/prevent…from doing/stop…from doing/keep…from doing。enter是及物动词，不和into连用。