中国石油大学 / 中石油
正确率:100%
8.(2.0分) ______ halfway through the exercise, the teacher changed his mind and collected all our papers.
A、When only being
B、When only being B. When we were only
C、Being only
D、Having been
A、When only being
B、When only being B. When we were only
C、Being only
D、Having been
参考答案: