单项选择题

He promised me a letter; he ought to ______ it days ago.

A. be written
B. have written
C. be writing
D. write
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单项选择题
I ______ everything by the time you get back next week.
A. shall finish
B. have finished
C. will be finishing
D. shall have finished
单项选择题
Mary ______ have been invited to the party, but she wasn’t.
A. must
B. should
C. can
D. would
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