The meeting was about to end and everyone was in a hurry to leave when Ted insisted ________ some questions.

A.on asking

B.to ask

C.asking

D.that he had asked

答案及解析： A

insist on doing，但insist后接宾语从句时用（should）do表示虚拟，意思是“坚决要求”，而作“坚持认为”时，应该用陈述语气．