I still remember the first day ___I went to school.我认为应该填when或是that或是不用填,但答案选了不填,而不选that,有明白的请指教.

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I still remember the first day ___I went to school.
我认为应该填when或是that或是不用填,但答案选了不填,而不选that,有明白的请指教.

能不加就不加