问题补充:
Both of my parents insisted a computer for me, but I don’t think it is necessary.
A. to buy
B. buying
C. on buying
D. in buying
答案:
A. to buy
B. buying
(答案→)C. on buying
D. in buying
解析:其实,动词 insist 后既不能接不定式也不能接动名词,因为insist 通常用作不及物动词;若语义上需接宾语,要借助介词 on或upon,即用于 insist on [upon] (doing) sth;但它有时的确也可用作及物动词,不过其宾语通常只能是 that 从句,而不能是普通的名词、代词或动名词。