单项选择题

I suppose you are not serious, ______

A. do I
B. don't I
C. are you
D. aren't you
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单项选择题
History is a record of mankind; different historians, ______, interpret it differently.
A. therefore
B. on the contrary
C. however
D. consequently
单项选择题
Thinking that you know()in fact you don't is not a good ide

A. what
B. that
C. when
D. which
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