2013一建实务真题解析:---we haven't heard from Jane for a long time.---what do you suppose ____(happen)to her

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has happened 和 happened 都可以
do you suppose 是插入语,作题是可以把它忽略,就是what has happened/happened to he ?

happened
do you suppose 作插入语,可以省去
what ____(happen)to her
显然应填happened

do you suppose是插入语,可以去掉,填happened

has happened