单项选择题

He put in a special ________ for an extra day's holiday so that he could attend his daughter's wedding.

A．request
B．requirement
C．demand
D．enquiry
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单项选择题
Their wedding will be quite an _______ i.e. a large number of people will attend.
A．accident
B．occurrence
C．incident
D．event
单项选择题
Frequent exposure to X-ray is harmful, so the use of X-ray should be limited to occasions when________.
A．primary
B．elementary
C．necessary
D．emergent
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