what was it______they werediscussing at that meeting?答案是that,为撒?为撒不能what?

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what was it______they werediscussing at that meeting?答案是that,为撒?为撒不能what?

what was it______they werediscussing at that meeting?答案是that,为撒?为撒不能what?
what was it______they werediscussing at that meeting?答案是that,为撒?
为撒不能what?

what was it______they werediscussing at that meeting?答案是that,为撒?为撒不能what?
因为这是一个定语从句,后面的原来修饰前面的it 所指代的内容,只能用that

前面已经用过what,后面避免重复,所以用what

后面的____they were discussing at that meeting明显就应该是what的定语从句。what不能引导定语从句,所以一开始就可以排除。that 在定语从句中的成分时were discussing的宾语.