问题
单项选择题
An explosion is a sudden increase in amount（）
A.rapid burning causes it
B.to be cause dby rapid burning
C.causing it'burningtoberapid
D.caused by rapid burning
答案
参考答案：D
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An explosion is a sudden increase in amount（）
A.rapid burning causes it
B.to be cause dby rapid burning
C.causing it'burningtoberapid
D.caused by rapid burning
参考答案：D