--I rang your flat yesterday

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--I rang your flat yesterday.A man answered,but I didn't recognize the voice. --Oh,it ___my brother Peter. A.must be B.must have been C.can have been D.might be 为什么选B？

解题思路：如下
解题过程：
选A。表示对过去事实有把握的推测，具有较大的可能性。只用于肯定句中，否定句和疑问句用can/ould have done。

---昨天我给你家打电话，一位男士接了电话，但我没听出来是谁的声音。
--哦，一定是我的哥哥彼得。
最终答案：略

were there any of your friend in your house/flat yesterday I rang you yesterday afternoon.A man answered ,but i didn't Your new flat is much laugh than I ____(think) yesterday morning i woke up only after the alarm clock rang. I rang her up yesterday,but nobody answered it.汉语意思 Yesterday morning I woke up only agter the alarm clock rang. I was____out_____the bell rang Where’s your flat? I heard your monther____ill yesterday.how____she now? i forgot your birthday yesterday 和 i forget that yesterday w while we were walking yesterday afternoon.the bell rang. She was reading a novel yesterday evening()the bell rang