With all his efforts_____ on helping the
题型:选择题
问题:
With all his efforts _____ on helping the company survive in the competition, the new manager is loved by all the staff.[ ]
A. concentrated
B. concentrating
C. to concentrate
D. concentrate
With all his efforts _____ on helping the company survive in the competition, the new manager is loved by all the staff.[ ]
A. concentrated
B. concentrating
C. to concentrate
D. concentrate