单项选择题

Professor Smith, along with his assistants,______ on the project day and night to meet the deadline.

A．work
B．working
C．is working
D．are working
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单项选择题
A modern city has been set up in ______ was a wasteland ten years ago.
A．what
B．which
C．that
D．where
单项选择题
It shames me to say it, but I told a lie when ______at the meeting by my boss.
A．questioning
B．having questioned
C．questioned
D．to be questioned
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