问题
I phoned you at 9 this morning but got noanswer.—I am sorry. I _____ the bell. I _____ inthe 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
B:didn’t have heard, must be
C:didn’t hear, must have been
D:didn’t hear, must be
正确答案是：
