Question

Grandpa is growing old. He keeps on       the same thing over and over again.

A．tell

B．tells

C．told

D．telling

Answer 1

D

试题分析：句意：爷爷在变老，他一遍又一遍地重复讲同一件事。keep on doing sth.持续做某事，后跟动名词，故选D。