Alice,do you know what was____?A.happened to him B.he doing at that time C.Mr Li's father D.his favorite subject

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Alice,doyouknowwhatwas____?A.happenedtohimB.hedoingatthattimeC.MrLi''sfatherD.hisfavoritesubjectAlice

Alice,do you know what was____?A.happened to him B.he doing at that time C.Mr Li's father D.his favorite subject
Alice,do you know what was____?
A.happened to him B.he doing at that time
C.Mr Li's father D.his favorite subject

Alice,do you know what was____?A.happened to him B.he doing at that time C.Mr Li's father D.his favorite subject
选B,问Alice知道他在那个时候正在做什么?
A不对,如果是发生了什么,不能用被动语态
C D两个答案则表示一般存在的状态,不应为过去式 was

B
A的happen不能用被动
C和D按语义不能用过去时

D

B

A项错误. happen不能用作被动 可改成 what has happened to him
BCD三项语法上都是正确的
B是指 你是否知道他那时在做什么
C指你是否知道李先生父亲以前的职业是什么 但这种问法不太礼貌
D指你是否知道他之前最喜欢的学科是什么