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

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(答案→)A. that; It
B. this; This
C. this; It
D. that; This
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。