问题补充：
Boys and girls, time is up, please check your name and your papers.
A. hand out
B. hand up
C. hand in
D. hand down
答案：
A. hand out
B. hand up
(答案→)C. hand in
D. hand down
解析：句意：同学们，时间到了。请写上你的名字上交你的试卷。hand in动词短语上交，结合句意，故选C.
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