he was nearly drowned once .when was( ( )was in 1998 when he was inmiddle school.

He was nearly drowned once .when was( ( )was in 1998 when he was inmiddle school.
A.that ,It B.this this C.this it D.that this
选项是A.
发生了的事用that指代；It代词【表时间、距离和天气】
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