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20.it was twenty years ago ______ he joined the party.

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20.it was twenty years ago ______ he joined the party.
A)as
B)when
C)since
D)that
It is...that...It was ...that...
是强调句型的固定用法.
强调句型
i.强调谓语或者其他成分
1.强调谓语动词一般在谓语动词原型前加do/does/did.时态是一般现在时,在动词原型前加do/does,时态是一般过去时,在谓语动词原型前加did.
2.强调句子其他成分用强调句型:“It+be+被强调成分+关系代词who/that+句子的其他成分”.
注意:
1)被强调的成分是人时,关系代词可以用who/that,强调其他成分时(除谓语动词外)一律用that.
2)在强调句中'be动词通常只有两种形式:一般现在时is,一般过去时was,但是不能排除带有情态动词的形式.