testify

她同意作证以换取减刑。

She agreed to ___testify in exchange for a reduced sentence.

她同意作证指控嫌疑人以换取豁免。

She agreed to ___testify against the suspect in exchange for immunity.

被告以自证其罪为由拒绝作证。

The defendant refused to ___testify on the grounds of self-incrimination.