问题描述：
when you speak English,you must make yourself --------.A:understand; B:understood
when you speak English,you must make yourself --------.
A:understand; B:understood
请给出答案,并说明道理.
when you speak English,you must make yourself --------.
A:understand; B:understood
请给出答案,并说明道理.
问题解答：
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