He was nearly drowned once.When was ?was in 1998 when he was in middle school.

问题补充：

--- He was nearly drowned once.

--- When was ?

--- was in 1998 when he was in middle school.

A. that; It

B. this; This

C. this; It

D. that; This

答案：

(答案→)A. that; It

B. this; This

C. this; It

D. that; This

解析：A[解析]that 用于指代前面提到的事。When was that? 那件事是什么时候发生的？回答When was that时，要用it指代上文提到的事。It was in 1998 when he was in middle school.那是在1998年他在中学时。