All members of the Baja basketball team are required to commit to a high-protein

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问题 All members of the Baja basketball team are required to commit to a high-protein and carbohydrate diet______training for the national games.

选项 A、when
B、that
C、by
D、at

答案 A

解析这句话的主要成分是“All members of the Baja basketball team are required to commit”，修饰成分是“______training for the national games”。根据上下文语义，此处表示“为了准备全国比赛而被要求吃高蛋白及碳水化合物的食物”，故这里应选时间状语从句引导词(A)when(当……的时候)。这句话中training for the national games是when they train for the national games改变后的状语从句形式，这里的引导词when不能省略。关系代词或名词性从句引导词(B)that，介词(C)by和(D)at都不适合填入空格处。training作为动名词与介词(C)by搭配使用表示“通过准备全国比赛来食用高蛋白及碳水化合物的食物”，意思不通。

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