31. The cheering went on for quite some time it died down and people took their seats aga

发布时间：2020-08-16 06:54:22


31. The cheering went on for quite some time      it died down and people took their seats again.
A. Before
B. Since
C. As
D. When

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(答案→)A. Before
B. Since
C. As
D. When
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