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
Facial tattooing is a standard ______ among certain peoples.
A．custom
B．habit
C．practice
D．tradition
单项选择题
______ we need to complete the construction is two million dollars.
A．All what
B．That all
C．That
D．What
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