Did you see him ________ the washing machine when you were walking ________.A.using; passB.use; pastC.to use; pastD.used; past
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B解析精析：see sb. do sth.表示“看见某人干什么”，do是不带to的不定式，作宾语补足语。walk past意为“走过去”，past在此作副词，也可说walk by。past和by也可作介词，后面接宾语。如：walk past(by)me从我身旁经过。另外动词pass也有相近的含义：walk past(by)=pass by。