Question

【题目】I'm afraid he's more of a talker than a doer，which is __________ he never finishes anything.

A. that

B. when

C. where

D. why

Answer 1

【答案】D

【解析】句意：恐怕与其说他是个实干家不如说他是个空谈家，这就是他总是一事无成的原因。在which引导的定语从句中，is后面是一个表语从句。通过句意可知答案是D。