题文
We should think hard ________ human activity has caused greenhouse effect.
| A．it is how that | B．how it is that |
| C．that how is it | D．how is it that |
推荐试卷
We should think hard ________ human activity has caused greenhouse effect.
| A．it is how that | B．how it is that |
| C．that how is it | D．how is it that |
试题篮
()
粤公网安备 44130202000953号
