— What are you doing outside the class? Didn’t you hear the clock ?—Sorry sir. I .A. stri

问题补充：

— What are you doing outside the class? Didn’t you hear the clock ?

—Sorry, sir. I .

A. strike; didn’t notice

B. striking; wasn’t noticing

C. is striking; didn’t notice

D. struck; wasn’t notice

答案：

A. strike; didn’t notice

(答案→)B. striking; wasn’t noticing

C. is striking; didn’t notice

D. struck; wasn’t notice

解析：hear sb. doing强调“听到某人正做某事”。第二个空，表示我过去没有注意，表示过去某一时间正在进行的动作，用过去进行时。

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