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

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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

单项选择题

Jack's father suggested that Jack（）in London for a few more days.

A．would stay
B．stay
C．had stayed
D．stayed

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