I have no idea what——when l was awayA.had happenedB.had happenedC.happenedD.will happen

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I have no idea what——when l was awayA.had happenedB.had happenedC.happenedD.will happen
I have no idea what——when l was away
A.had happened
B.had happened
C.happened
D.will happen

I have no idea what——when l was awayA.had happenedB.had happenedC.happenedD.will happen
C
这里强调的是过去发生的事情,而不是强调事情已经发生的状态,所以不需要用完成时,过去时即可.

A

c
happen是不及物动词,没有被动形式
D第一个排除,你应该知道的