He knew it b___(9)he got a phone call from the old woman.

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He knew it b___(9)he got a phone call from the old woman.

He knew it b___(9)he got a phone call from the old woman.
He knew it b___(9)he got a phone call from the old woman.

He knew it b___(9)he got a phone call from the old woman.
because
他知道这件事,因为一个老妇人给他打过电话

before

because