来自董青的问题
Haveyoufinishedyourhomework?Yes,I___ithalfanhouragoAdidBisdoneCwasdoneDhavebeendone我认为是A请说明理由
Haveyoufinishedyourhomework?Yes,I___ithalfanhourago
AdidBisdoneCwasdoneDhavebeendone
我认为是A
请说明理由


Haveyoufinishedyourhomework?Yes,I___ithalfanhouragoAdidBisdoneCwasdoneDhavebeendone我认为是A请说明理由
Haveyoufinishedyourhomework?Yes,I___ithalfanhourago
AdidBisdoneCwasdoneDhavebeendone
我认为是A
请说明理由
A
...ago用在过去时中
B是一般现在时的被动语气
c是一般过去时的被动语气
d是现在完成时的被动语气