You’ll start having positive results            you replace negative thoughts with positive ones .
A．sinceB．unlessC．until D．once
D

試題分析：句意：一旦你用積極的思考代替消極的思考，你將開始有積極地結(jié)果。since自從，引導(dǎo)時(shí)狀語(yǔ)從句；unless除非，引導(dǎo)時(shí)間狀語(yǔ)從句；    until 直到，引導(dǎo)時(shí)間狀語(yǔ)從句；once一旦，引導(dǎo)條件狀語(yǔ)從句。根據(jù)句意前后是條件與結(jié)果的關(guān)系，因此用連詞once來引導(dǎo)。故選D。
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