单选题If you don’t know th

问题补充：

单选题Ifyoudon’tknowtheanswertosomething,yousay:“______”A.Sorry, I don’t understand.B.I’m sorry. I don’t know.C.Can I speak English?D.Excuse me. How do you say that in English?

答案：

B解析试题分析：如果不知道问题的