John passed the examination though he had only spent _______ on the subject as others had doneA.as half time muchB.as half much timeC.half as time muchD.half as much time
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D解析考查倍数问题。as...as 结构，此句型意为“…和…一样…”。中间可加形容词、副词、可数不可数名词，本题中time是不可数名词，结构为as much/little＋<不可数名词>＋as，因此half不能出现在as...as中间