— What did she want to know Tom? — She wondered we could complete the experimentA. when

问题补充：

— What did she want to know, Tom?

— She wondered we could complete the experiment

A. when was it

B. it was when that

C. it was when

D. when it was that

答案：

A. when was it

B. it was when that

C. it was when

(答案→)D. when it was that

解析：分析句子意思以及句子结构可知，空格部分为强调特殊疑问词when，且为宾语从句结构，故特殊疑问句必须置于主从句之间，并且要使用陈述语序，故应选when it was that。