It was not he took off his dark glasses I realized he was a famous singerA.when; thatB.until; thatC.until; whenD.when; then
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B解析试题分析：句意：正是直到他摘下他的墨镜我才意识到他是一个著名的歌星。not......until......直到......才.......; . 强调句的结构：It was +被强调的内容+that+剩余内容；第一空not until he took off his dark glasses是被强调的内容，第二空用that来引导剩余内容。故选B。考点：考查强调句的用法。