單項選擇（每題1分）
We must think twice _____ we make the final decision.
A．whenB．whileC．untilD．before
D
連詞辨析。When當(dāng)……時 ；while一邊……一邊；強(qiáng)調(diào)動作同時進(jìn)行；until直到，常和not連用；before在……之前。句意：在我們做最后決定之前，我們必須思考兩次。（必須三思而后行）。結(jié)合語境可知選D。
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