Suddenly,as she was riding fast,she()sirens（警笛）.A.heard B listened to C found D saw
问题描述：
Suddenly,as she was riding fast,she()sirens（警笛）.A.heard B listened to C found D saw
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答
heard
首先确定是听见
所以A or B
listen表示聆听这种状态,比如我在听你讲话 - i'm listening to your speech
heard表示听见.The sound of the sirens was getting(),so Debbie looked()her to see what was happening.4.是选close and close 还是closer and closer5.A after B in front ofC behind D before 选哪个？closer and closer - 越来越x都是比较级比如more and morefaster and faster5.可以确定是回头看，否则不用特意强调所以要么是behind，要么是afterafter表示的是debbie在X的后面，而不是X在她后面所以选behindlooked behind her