单项选择题

When confronted with such questions, my mind goes ______ , and I can hardly remember my own date of birth.

A．dim
B．vain
C．faint
D．blank
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单项选择题
Hong Kong was ______ to Britain after the Opium War.
A．congregated
B．castigated
C．ceded
D．exceeded
单项选择题
The best solution to the problem can only be found by a process of trail and ______.
A．mistake
B．error
C．success
D．experiment
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