I rang you yesterday afternoon.A man answered ,but i didn't recognize the voice._it my uncle ,he was in my room then.正确答案给的是must have been.不过这里用must be 不可以么,觉得应该不是虚拟语气,而是情态动词的问题.
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![I rang you yesterday afternoon.A man answered ,but i didn't recognize the voice._it my uncle ,he was in my room then.正确答案给的是must have been.不过这里用must be 不可以么,觉得应该不是虚拟语气,而是情态动词的问题.](/uploads/image/z/4130952-24-2.jpg?t=I+rang+you+yesterday+afternoon.A+man+answered+%2Cbut+i+didn%27t+recognize+the+voice._it+my+uncle+%2Che+was+in+my+room+then.%E6%AD%A3%E7%A1%AE%E7%AD%94%E6%A1%88%E7%BB%99%E7%9A%84%E6%98%AFmust+have+been.%E4%B8%8D%E8%BF%87%E8%BF%99%E9%87%8C%E7%94%A8must+be+%E4%B8%8D%E5%8F%AF%E4%BB%A5%E4%B9%88%2C%E8%A7%89%E5%BE%97%E5%BA%94%E8%AF%A5%E4%B8%8D%E6%98%AF%E8%99%9A%E6%8B%9F%E8%AF%AD%E6%B0%94%2C%E8%80%8C%E6%98%AF%E6%83%85%E6%80%81%E5%8A%A8%E8%AF%8D%E7%9A%84%E9%97%AE%E9%A2%98.)
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