If you really want yourself to be in good health, you must＿＿＿always＿＿＿so much.
A．not； be smokingB．not； have smoked
C．not； to smokeD．be not； smoking
A
mustn’t be doing與always連用，表示“一定不要總是在做……”，含有“埋怨、不滿”等感情色彩。
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