so when i knocked at the door, my heart ______(beat) very fast.填beat还是was beating?还是
sowheniknockedatthedoor,myheart______(beat)veryfast.填beat还是wasbeating?还是都可以?为什么?谢谢!...
so when i knocked at the door, my heart ______(beat) very fast.填beat还是was beating?还是都可以?为什么?谢谢!
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