Never stand up ________ you are asked to.
A．ifB．sinceC．unlessD．when
C
連詞詞義辨析題。A. if 如果  B. since 自從…以來(lái)  C. unless 除非  D. when 當(dāng)…時(shí)候    “除非叫你否則不要站起來(lái)”
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