insist doing还是insist to do

该说insist doing还是insist to do? 请看下面一道题：

They insisted _________ a car over to fetch us.

A. to send                  B. sending                   C. on sending             D. in sending

很多同学想当然地认为 insist 后接动词时要用动名词，从而误选B。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；有时它也用作及物动词，但其宾语通常只能是 that 从句，而不能是普通的名词、代词或动名词。有的同学可能是根据 insist on doing sth 这一结构，想当然的认为 insist 后要接动名词，忽略了其间的介词 on。正确答案应选C。又如：(from www.nmet168.com)

I insisted on buying a quality ear. 我坚持买一辆高质量的车。

He insisted on the observance of training roles. 他坚持遵守训练规则。

They insisted on being treated as equals. 他们坚持对他们要平等相待。

He went to the meeting and, what was worse, insisted on speaking. 他去参加了会议。更糟糕的是，还坚持要发言。