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单项选择题

If a fever______, a doctor should be called since this may mean that a more serious infection is present.

A. disappears
B. persists
C. perishes
D. vanishes
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热门试题

单项选择题Our telephone has been______for three weeks.

A. out of line
B. out of touch
C. out of order
D. out of place

单项选择题These machines have been idle for the past months.

A. been working well
B. been working badly
C. not been in service
D. not been running at all