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
Communication is the process of ______a message from a source to an audience via a channel.
A．transmitting
B．submitting
C．transforming
D．switching
单项选择题
______ she realized it was too late to go home.
A．No sooner it grew dark than
B．Hardly did it grow dark that
C．Scarcely had it grown dark titan
D．It was not until dark that
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