2、The young college students jumped into the river and swam to the boys ________they heard them crying for help．

A．a(chǎn)s soon as          B．before           C．because         D．till

2、A

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The young college students jumped into the river and swam to the boys ________they heard them crying for help．

A．a(chǎn)s soon as          B．before           C．because         D．till

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