【答案】The young college students jumped into the river and swam to the boys _________ they heard them cryi

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

A. as soon as B. before C. because D. till

【答案】

A

【解析】

句意：那些年轻的大学生一听见男孩呼救，就跳进了河里，游向了他们。as soon as一…….就……，before在……之前，because因为，till直到。根据句意，此处表示男孩一呼救，年轻的大学生们就跳进河里，游向他们，故用as soon as。故选A。