________ a child begins school, he enters a world of vicious competition where success and failure are clearly defined and measured.
A．BeforeB．UntilC．WheneverD．The moment
D
考查狀語(yǔ)從句。句意“一個(gè)孩子一開始上學(xué)，他就踏進(jìn)了一個(gè)充滿各種各樣的競(jìng)賽的世界，在那里，成功與失敗都被清楚地定義和測(cè)量�！盇“在......之前”；B“直到”；C“無論何時(shí)”；D“一......就”。D項(xiàng)最符合題意。故選D。
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