ad肯定错误,a应该用rings,d应该用ring
关键在于判断bc
前半句用的是当我们看电视的时候,但是省略了we,因此后面必须不足we,否则前后句主语不一致,该句就不正确,因此选择c
While watching TV,----- A the doorbell ring B the doorbell rings C we heard the doorbell ring D we heard the doorbell ri
While watching TV,----- A the doorbell ring B the doorbell rings C we heard the doorbell ring D we heard the doorbell rings 要 理由
英语人气：839 ℃时间：2020-01-29 05:47:55
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