when I opened the window,I hearsome birds_________in the tre

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when I opened the window,I hearsome birds_________in the tree A.to sing B.singing C.sang D.sing
为什么选B.这是过去时而b是进行时啊

固定搭配：hear sth do/doing ①如果是听见了整个过程则用do（动词原形）②如果是听见某人正在做则使用doing（动词ing形式）这里是指当我打开窗时,我听见鸟儿正在唱歌,前面有when（当.时）所以肯定是正在做,所以用doing,选B.这是固定搭配,与时态无关,在后半句中heard才是动词
自己码字的,求给分.

when I opened the window,I hearsome birds_________in the tre --Would you mind if I opened the window? When I opened the book ,I found several ( ) pages. When I opened the door,I (get) a big surprise I shut the door of the mind,because I opened a window The snow lasted until last Friday.I opened the window this m 英语翻译I've opened the curtain of my east window here above the When he woke up,I opened the door.可不可以这样? I had hardly opened the door when he rushed in I ______ his face when he opened the letter. I sit ----------the window I thought the kitchen window must ____(be) opened,(用括号词的适当形式