The first atom bomb was __________ over Hiroshima.
A. set out
B. set off
C. set about
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I look forward to your __________ support.
A. keep on
B. continue
C. continuous
How much did it cost you to study __________?
A. broad
B. aboard
C. abroad
Excel 是一个( )
A. 文字处理软件
B. 图形处理软件
C. 电子表格软件
D. 演示文稿制作软件