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．blank
C．faint
D．vain
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单项选择题
Where can I find Jim He is ______ his work. He won't leave the lab until 6:00 p.m.
A．on
B．over
C．at
D．under
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