题文
Bob promises to join in the football match ______ he has to help his parents on the farm.
| A．if | B．as | C．unless | D．when |
Bob promises to join in the football match ______ he has to help his parents on the farm.
| A．if | B．as | C．unless | D．when |
试题篮
()
粤公网安备 44130202000953号
