问题补充：
32. ---Why on earth didn’t you answer the phone?
---I’m sorry, but the doorbell too.
A. is ringing
B. was ringing
C. rang
D. was about to ring
答案：
A. is ringing
(答案→)B. was ringing
C. rang
D. was about to ring
解析：可联系答.案.网客服索取。
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