Mr. Smith found that gas from the pipe when he came back because we forgot to switch off.

问题补充：

Mr. Smith found that gas from the pipe when he came back because we forgot to switch off. But at last we were lucky to escape .

A. escaped, being punished

B. was escaping, being punished

C. escaped, punishment

D. was escaping, punishing

答案：

A. escaped, being punished

(答案→)B. was escaping, being punished

C. escaped, punishment

D. was escaping, punishing

解析：可联系答.案.网客服索取。