单项选择题

Thinking that you know______in fact you don't is not a good ide

A． whatB. thatC. whenD. which
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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
Helen was much kinder to her youngest child than she was to the others, ______, of course, made the others jealous.
A．who
B．what
C．that
D．which
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