单项选择题

It is known to all ______ discovered the America continent.

A．how
B．who
C．when
D．why
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单项选择题
______ you say, I am sure that the woman is innocent.
A．Whatever
B．However
C．Whoever
D．Wherever
单项选择题
This classroom is ______ that one.
A．twice big than
B．twice as big as
C．bigger twice than
D．twice more bigger than
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