题目内容

Thefuelinjectorinjectsafinesprayoffuelintothehotairandcombustion（）,producingmuchhighpressureinthegases.

A. hasbegun
B. takesplace
C. occurs
D. happens

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按规定，当日累计（）美元以下的外币存款，可由他人直接代办存款业务。

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