________ he stops driving himself like this, he'll have a breakdown.
A．UntilB．Once
C．SinceD．Unless
D
D 考察連詞。句義：如果他在不停止這么賣命的工作，他就會崩潰。Until意為直到..為止；once一旦；since既然，unless除非，如果不..相當(dāng)于if..not。根據(jù)語境可知D正確。
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