◎ 题干
I have just come in to see if I can be _____ any assistance to them.
[     ]
A. with
B. on
C. at
D. of
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“I have just come in to see if I can be _____ any assistance to them. [ ]A. withB. onC. at D. of …”主要考查了你对  【介词和介词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。