It was after careful consideration we decided to take action.A. whichB. thatC. whyD. when

问题补充：

It was after careful consideration we decided to take action.

A. which

B. that

C. why

D. when

答案：

A. which

(答案→)B. that

C. why

D. when

解析：本题考查强调结构。强调句结构：it is/was + 强调部分 + that，本题强调状语after careful consideration，故选B。