C语言的源程序通常以 作为其扩展名，生成的可执行程序的扩展名为_____________。
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可以用____________对C程序的任意部分作注释，用__________对C程序作单行注释。
What is the function of using modals like "could", "need to", "should" in giving instructions?
A. To show the sequence.
B. To avoid being too direct.
C. To be clear.
D. To make sure whether the speaker is understood.
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