15He said he ()(return) the book as soon as he ()(finish) reading it
问题描述：
15He said he ()(return) the book as soon as he ()(finish) reading it
答
would return
finished
答
would return, finished.
答
would return finished
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答
would return;finished
这是从句，以said为准，都用过去式。他说了：“他一读完它，就将把书还给我”。这句话的意思大致如此，所以前面用过去将来式
答
15He said he (will return )(return) the book as soon as he (finishes)(finish) reading it
答
will return finishes
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