问题

Witnessing the explosion(爆炸) in a chemical plant in Kunshan is the most frightening experience ______ I have ever had.
A:that
B:when
C:which
D:who;
B:when
C:which
D:who;
正确答案是:
同类题型
Most of what has been said about theSimiths also true of the Johnsons
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