题目内容
The fire service began to wonder _______ the fire was caused by cigarette ends that people carelessly threw away.
[ ]
A. that B. what C. which D. whether
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
题目内容
The fire service began to wonder _______ the fire was caused by cigarette ends that people carelessly threw away.
[ ]
A. that B. what C. which D. whether
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||