It was after he had worked on the projec
题型:选择题
问题:
It was after he had worked on the project for months _____ he found how to solve the problem efficiently. [ ]
A. that
B. when
C. until
D. as
It was after he had worked on the project for months _____ he found how to solve the problem efficiently. [ ]
A. that
B. when
C. until
D. as