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问题: 一道英语选择题

"I'm really tired and there are so many things to do.""Well,if it would be( )any help,I would do some cooking."
A.in
B.of
C.with
D.for
这道题的正确答案是B,be of help这是什么固定搭配吗?那为什么这里不用with?

解答:

be of + 名词=相应的形容词
eg: be of help=helpful
be of use=useful
be of important=important

.""Well,if it would be( )any help,I would do some cooking." 不能用with be with sth 的意思是 什么什么和什么什么在一起,相随for example:I will be with you.即:我将和你在一起,在这里显然不恰当 出题者加入with选项是为了迷惑考生with“有”的意思,