Don't promise anything ________ you are one hundred percent sure.
A.whetherB.afterC.howD.unless在线课程D
考查连词的用法。unless意为“除非，如果不”。全句意为：除非你有百分之百的把握，否则不要作出任何承诺。whether意为“是否”，after意为“以后”，how意为“怎么样”。A项干扰性较强，本题较易。
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