问题

ntence , so he asked the teacher toexplain it again.
A:Not havingunderstood
B:As he didn’t understand
C:Having notunderstood
D:He didn’t understand
B:As he didn’t understand
C:Having notunderstood
D:He didn’t understand
正确答案是:
同类题型
not an actor, who often appeared onstage, _____ a writer, writing stories.
arted studying medicine at college, but ______to Business Studies in her second year.
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The parcel was a whole week late. How I wish Iairmail instead.