单项选择题

A) and floated C) and floating
B) floated D) to float

A．and floated
B．floated
C．and floating
D．to float
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单项选择题
A) therefore C) whichB) so D) that
A．therefore
B．so
C．which
D．that
单项选择题
A) merely C) evenB) at least D) just
A．merely
B．at least
C．even
D．just
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