题目内容
15．All the children were swimming in the river______they heard a girl ____"help"．（ ）| A． | when，shouting | B． | while，to shout | C． | when，to shout | D． | while，shouting |
分析 当听到一个女孩喊救命时，所有的孩子都在河里游泳．
解答 答案：B．考查连词．句意"当听到一个女孩喊救命时，所有的孩子都在河里游泳．"．While只能与延续性动作连用，heard听到，非延续性动词，故排除B，D．hear sb．doing sth．听到某人正在做某事．因此C不正确．When可以引导非延续性动作．故答案为A．
点评 连词可以表并列、承接、转折、因果、选择、假设、比较、让步等关系，要结合语境，选择合适连词用法．
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