Question

someone knocks l__ the door

从所给的四个选项中选择最佳答案 Listen! Someone _ the door. [ ] A. knock on B . knocks to C. knocked at D . is knocking at

Answer 1

答案:D 核心短语/句式:knock at:敲 翻译:听!有人敲门。 解析:listen就明显地提示要用现在进行时态,所以,只有D正确。