The students ______ busily when Miss Brown went to get a boo

The students ______ busily when Miss Brown went to get a book she ______ in the office.
选项:
a、had written … left
b、were writing … has left
c、had written … had left
d、were writing … had left
选什么为什么?

da139 1年前已收到1个回答举报

葱绿的日子幼苗

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选d,状语从句（即when···）是过去时,主句动作和从句动作同时发生也应用过去时态,根据表达意义主句动作应该正在进行所以主句应用过去进行时.a book she ______ in the 这一部分she ______ in the office是定语从句修饰a book ,去拿书是过去时,落在办公室这一动作应该是过去的过去,所以应用过去完成时

1年前

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