单项选择题

Section A

A．$8.
B．$7.
C．$4.
D．$3.5.
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单项选择题
The conference ______ a full week by the time it ends.
A．must have lasted
B．will have lasted
C．would last
D．has lasted
单项选择题
______ evidence that language-acquiring ability must be stimulated.
A．If being
B．It is
C．There is
D．There being
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