Thelightison.He___________________athome.（） A: musthavebeen B: wouldbe C: mustbe D: willbe
Thelightison.He___________________athome.（） A: musthavebeen B: wouldbe C: mustbe D: willbe
Bythetimeof1969,thereweremanyspaceexplorations. A: havebeen B: mustbe C: hadbeen D: musthavebeen
Bythetimeof1969,thereweremanyspaceexplorations. A: havebeen B: mustbe C: hadbeen D: musthavebeen
musthavebeen是对过去正在进行的事肯定?还是对过去的事进行肯定?
musthavebeen是对过去正在进行的事肯定?还是对过去的事进行肯定?
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