单项选择题

The old man can't walk ______ to catch the bus.

A．enough fast
B．fast enough
C．slowly enough
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单项选择题
Please tell us ______ .
A．when do they come
B．when will they come
C．when they will come
单项选择题
Now summer has arrived, the days are getting ______ .
A．hot and longer
B．hotter and long
C．hotter and longer
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