If you really want yourself to be in good health, you must ___ always ___ so much.
A．not; be smokingB．not; have smokedC．not; to smokeD．be not; smoking
A
must not always be doing sth. 表示“不要老是做謀事”，含有埋怨、指責(zé)、反感等感情色彩。
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