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  3. If you really want yourself to be in good health, you must always ______ so much.

If you really want yourself to be in good health, you must always ______ so much.

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问题 If you really want yourself to be in good health, you must always ______ so much.
选项 A、not... be smoking
B、not... have smoked
C、not... to smoke
D、be not... smoking
答案A
解析 must的否定形式应该是must not+动词原形，本句用be smoking进行形式表示将来的动作。
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