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．faint
C．vain
D．blank
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单项选择题
As it turned out to be a small house party, we need not have dressed up so ________.
A．previously
B．formerly
C．casually
D．formally
单项选择题
For workers in small firms employment ________ are very rare, working hours are longer and safety records poor.
A．guarantees
B．reservations
C．securities
D．assumptions
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