单项选择题

The twentieth century has witnessed an enormous worldwide political, economic and cultural______.

A．tradition
B．transportation
C．transmission
D．transformation
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单项选择题
She possessed a quick mind, a sharp tongue and ______ a strong will.
A．above all
B．first of all
C．most of all
D．and all
单项选择题
If he hadn't stood under the ladder to catch you when you fell, you ______ here now.
A．wouldn't be smiling
B．won't smile
C．couldn't have smiled
D．didn't smile
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