New research shows that.
问题描述：
New research shows that.
New research shows that ______ a hands-free cell phone is just as risky as using a handheld cell phone.
A.driving to use
B.drive using
C.drive to use
D.driving using
请问是选A吗?如果不是那选什么为什么?
答
应该选D吧 New research shows that [driving（从句的主语)][using a hands-free cell phone（修饰driving)]is just as risky as using a handheld cell phone.