问题
选择题
I am afraid he's more of a talker than a doer, which is ________ he never finishes anything.(2011·山东)
A．that
B．when
C．where
D．why
答案
答案：D
D [考查表语从句。句意：我恐怕他比起来一个实践家更是一个空谈家，那就是他一事无成的原因。本文“which is..”引导的一个非限定性定语从句中有一个表语从句根据句意用“why”引导。]
