I __________ finished writing the book by the end of the month.
A、should have
B、shall have
C、must have
D、might have
【正确答案】：B
【题目解析】：by the end of the month是将来时，B项：shall表示将来，句子大意：到这个月底，我本将要写完这本书。B项最符合题意。
I __________ finished writing the book by the end of the month.
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