Question

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

D解析：句意：恐怕他说的比做的多，这就是他一事无成的原因。此处考查系动词be后的表语从句的引导词，根据句意，D项正确。