题目内容
______ halfway through the exercise, the teacher changed his mind and collected all our papers.
| A.When only being | B.When we were only |
| C.Being only | D.Having been |
B
我们只做了一半练习老师就改变了主意把我们的试卷收了上去。因为主句与从句的主语不一致所以不能用分词做状语故选B
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