we haven't heard from Jone for a long time.--what do you suppose___to her.以下选哪个答案was happening B.is happened C.has happened D.had happened.这是被动语态的单项选择题

we haven't heard from Jone for a long time.--what do you suppose___to her.以下选哪个答案was happening B.is happened C.has happened D.had happened.这是被动语态的单项选择题
we haven't heard from Jone for a long time.--what do you suppose___to her.以下选哪个答案
was happening B.is happened C.has happened D.had happened.这是被动语态的单项选择题

we haven't heard from Jone for a long time.--what do you suppose___to her.以下选哪个答案was happening B.is happened C.has happened D.had happened.这是被动语态的单项选择题
C HAPPEN不及物无被动语态 STH HAPPEN TO SB,某人发生了某事

印象中做过这题，答案不是很清楚了。
按我判断应该是C。

D 有 suppose要用虚拟语气 过去式要变为过去完成时
`happen不用被动态

c