单项选择题

People in that district ______ use oil lamps, for there is no gas or electricity.

A．can
B．may
C．must
D．have to
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单项选择题
He was so ______ to his studies that he hardly noticed me.
A．intent
B．absorbed
C．attentive
D．concentrated
单项选择题
People who ______ work should
A．will, be made to work
B．won't, be made work
C．won't, be made to work
D．will, be made working
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