问题
选择题
Both of my parents insist ______ a computer for me, but I don’t think it is necessary.
A．to buy
B．on buying
C．buying
D．in buying
答案
答案：B
insist on doing sth.是固定搭配的短语，on为介词，后面动词接ing形式。所以正确答案为B
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