Question

I failed in the examination last term and only then ____ the importance of studies.

A．I realized

B．I had realized

C．had I realized

D．did I realize

Answer 1

D

句意：上學(xué)期期末考試我沒考及格，只在那時(shí)我才意識到學(xué)習(xí)的重要性。Only修飾狀語then位于句首時(shí)需使用部分倒裝，本句的時(shí)態(tài)應(yīng)使用一般過去式。