书名：新多益必考600单
页数：p.5
题目：I don't feel any ___ to give my boss more than two weeks notice when I l
eave.
(A)oblige
(B)obligatory
(C)obliged
(D)obligation
疑问：为什么答案是D，不是B。feel后面不是该加形容词或子句吗？