书名：挑战新多益阅读满分2(寂天)
页数：19
题目：109题 The film's lead actress is _____ to appear at twelve press events
in the next two months.
(A)obligated
(B)obligating
(C)having obligated
(D)obligate
答案为A，我选D 想请问一下为什么答案是A