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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单项选择题
The vision of that big black car hitting the sidewalk a few feet from us will never be ______ from my memory.
A．ejected
B．escaped
C．erased
D．omitted
单项选择题
We shall probably never be able to ______ the exact nature of these sub-atomic particles.
A．assert
B．impart
C．ascertain
D．notify
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