单项选择题

Millions of people in the United States suffer from ______ back pain that comes from sitting too long at a desk.

A．chronic
B．casual
C．catastrophic
D．elastic
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单项选择题
Although the media have paid a great deal of attention to telecommuting, in most cases it is the employee's situations, not the availability of technology, that ______ a telecommuting arrangement.
A．precipitates
B．reciprocates
C．anticipates
D．apprehends
单项选择题
It didn't seem to have ______ to her that once she was addicted to drug smoking, she could hardly give it up. But it did happen.
A．happened
B．took place
C．occurred
D．came about
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