—Ihaven'tseenmygrandparentsforlong.I'mtoobusy

问题详情：

—I haven't seen my grandparents for long.I'm too busy__ __ them these days.

—Why not call them instead？

A．visit   B．to visit  C．visiting  D．visit

【回答】

B

知识点：非谓语动词

题型：选择题