单项选择题
A．to have injured B．to have been injured C．injured D．injuring
The doctor said that the patient had（）at once. A．to ope...
单项选择题The doctor said that the patient had（）at once.
A．to operate B．to be operated C．to operate on D．to be operated on
The St.Lawrence Seaway, running between British Columbi...
填空题The St.Lawrence Seaway, running between British Columbia and New York, completed by the United States and Canada in 1959（）.
