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—I phoned you at 9 this morning but got no answer.

—I am sorry. I _____ the bell. I _____ in the garden.

A.didn’t have heard, must have been

B.didn’t have heard, must be

C.didn’t hear, must have been

D.didn’t hear, must be

高三英语单项填空中等难度题

少年,再来一题如何?
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