If we_________ sunlight_________ a dry leaf with a piece of glass, it may start burning.
| A．work; out | B．carry; out | C．focus; on | D．concentrate; on |
相关知识点
推荐试卷
If we_________ sunlight_________ a dry leaf with a piece of glass, it may start burning.
| A．work; out | B．carry; out | C．focus; on | D．concentrate; on |
试题篮
()
粤公网安备 44130202000953号
