He will surely finish the job on time in that he’s left to do it in his own way .
A B C D
C 改为 provided.
考查连词。Provided that 如果是....条件是...。根据句意是“如果他能以自己的方式做这件事的话， 他就确定能够按时完成任务”所以要把 in 改为 provided.