题文
He found_ ________very difficult ________the math problem．
| A．that, to solve | B．this, solving |
| C．it, to solve | D．it, solving |
He found_ ________very difficult ________the math problem．
| A．that, to solve | B．this, solving |
| C．it, to solve | D．it, solving |
试题篮
()
粤公网安备 44130202000953号
