国家开放大学 / 综合英语（2）
正确率：100%
2. I _ _ _ _ _ in bed when I _ _ _ _ footsteps.
a.was reading, was hearing
b.read, heard
c.read, was hearing
d.was reading, heard
a.was reading, was hearing
b.read, heard
c.read, was hearing
d.was reading, heard
参考答案：
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