—Can you work out the problem?   —I can’t ______your explain how to do it.
A．but forB．exceptC．a(chǎn)part fromD．unless
D
連詞辨析。A. 要不是 B.除了；要不是  C.除了；缺少    D.除非。句意：你能算出這道題嗎？——我不能除非你能解釋一下怎樣做。選D。
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