问题
单项选择题
I forgot to return the book to you yesterday. So I（）today.
A.might do it
B.must do it
C.had to do it
D.must have to do it
答案
参考答案：B
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I forgot to return the book to you yesterday. So I（）today.
A.might do it
B.must do it
C.had to do it
D.must have to do it
参考答案：B