单项选择题

Professor Johnson will give a lecture on ______ the Roman Empire failed to conquer Asia.

A．why
B．what
C．who
D．that
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单项选择题
______ it with me and I'll see what I can do.
A．When left
B．Leaving
C．If you leave
D．Leave
单项选择题
Li Ming ______ a book about applying for universities in the United States and now she must have finished it.
A．has written
B．wrote
C．had written
D．was writing
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