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.
If you want to ask someone how to do something, you can say___________
A. Excuse me, could you show me how to make/use it?
B. I wonder if you could tell me how this works.
C. Excuse me, where is the nearest subway station?
D. Would you mind showing me how to use it?
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