You’ll fail your next English exam _______ you work harder from now on.
A．ifB．whether
C．untilD．unless
D

試題分析：句意：你下次英語考試會考砸的，除非你從現(xiàn)在開始更努力地工作。if如果，whether是否，until直到，unless除非。因此，選D。
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