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问题: 选择题

-Could you find an answer to your problem in the book I gave you?
-I looked at it,but it wasn't really______.
A.much used B.able to use C.of useful D.of much use

解答:

D.of much use

of +抽象名词, 表示该名词的形容词意思,在句子作表语。
即:of much use,相当于much useful