均可引導名詞性從句（主賓表）
what 意為“什麼、所...的”，可充當主賓表成分
that 無實意，不充當任何成分，僅起到連接作用
做題方法：看從句是否缺成分，不缺：that，缺什麼：what
例句：
I had no idea that you were here.
I had no idea what to do next.
練習
It's thirty years since we last met.
but I still remember the story,believe it or not,_ we got lost on a rainy day.
A.what B.that C.which D.when
解析：從句不缺成分，所以用that引導，其中that 無實際意思，不做任何成分。
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