has mary fininshed reading the book tom isn'tsure（合并成带宾语从句的复合句） tom isn't sure __ ＿ ＿ Mary finsinshded reading the book
问题描述：
has mary fininshed reading the book tom isn'tsure（合并成带宾语从句的复合句） tom isn't sure __ ＿ ＿ Mary finsinshded reading the book
答
tom isn't sure [whether] Mary has finished reading the book. whether引导表示“是否”的一般疑问句的宾语从句
答
whether if has