1 Edward,you play so well.But I____you played the piano.

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1 Edward,you play so well.But I____you played the piano.
A didn't know B hadn't known C don't know D haven't known
2 The children all turned ____ the famous actress as she entered the classroom.
A looked at B to look at C to looking at D look at

第一个选A
从意思上看便可以了,你弹得真好,我以前都不知道你会弹呢,这个不知道指的是以前的,所以用过去时.
第二个选B
turn 在此使用了过去式,表明其是动词,所以AD错,排除.
正确用法是turn to do sth.所以选原型.

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