问题描述：
新概念3册的一道关于时态的题目
After her husband had gone to work and the children_______to school,she went upstairs.
A were sent B had been sent
新概念三册的一道题目 可我觉得应该是B
After her husband had gone to work and the children_______to school,she went upstairs.
A were sent B had been sent
新概念三册的一道题目 可我觉得应该是B
问题解答：
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