Đáp án:

It was reported thay flowers were killed by frost

Giải thích các bước giải:

 She reported that the flowers had been killed by frost

`->` It was reported thay flowers were killed by frost

______

Cấu trúc bị động kép `:`

S + be + said/thought/supposed + to have + Vpp + O

`->` It +  be + said/supposed/thought/reported + that + O`

`->` S + be + said/thought/reported + to V + O

$@mocmoc1603$

$\text{She reported that the flowers had been killed by frost.}$

⇒ $\text{It was reported that the flowers were killed by frost.}$

* Cấu trúc bị động kép: 

It +  be + said/reported + that + O + ....

$#hoctot$