2. 外语
  3. There was an accident in this street this morning and ______ there has been a severe congestion of traffic.

There was an accident in this street this morning and ______ there has been a severe congestion of traffic.

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问题 There was an accident in this street this morning and ______ there has been a severe congestion of traffic.
选项 A、until that
B、since then
C、for which
D、after that
答案B
解析 根据从句中用完成时has been来看，应该选择since then。
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