单项选择题

（） announcing his retirement, Mr. Kinsley has been busy trying to train his replacement.

A.Because
B.Once
C.Since
D.While

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Mark's Warehouse Clearance Store is having sale with savings of up to 40 percent off on all clothing this weekend （） celebration of its 25th anniversary.

A.in
B.at
C.on
D.of
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Scarborough General Hospital has two （） for certified X-ray technicians to start immediately.

A.open
B.opener
C.openings
D.openness
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