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题目内容
（石家庄铁道大学大学英语II）
An explosion is a sudden increase in amount __________.
A、 rapid burning causes it
B、 to be caused by rapid burning
C、 causing its burning to be rapid
D、 caused by rapid burning
A、 rapid burning causes it
B、 to be caused by rapid burning
C、 causing its burning to be rapid
D、 caused by rapid burning
参考答案
