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单选题
12.Volunteer teaching in the west is the most challenging jobI have ever had.
A
A. that
B
B. whom
C
C. which
D
D. this
答案解析
正确答案：A
解析：
12.【翻译】在西部支教是我做过的最具挑战性的工作。【精析】A分析句子结构可知，空处引导的是一个定语从句，修饰先行词job,且先行词被the most challenging修 饰 当先行词被形容词最高级、序数词，以及the only, the very, the right, the last等词修饰时，关系代词只能用that, 而不能用which因此，空处应用关系代词that,在从句中作had的宾语,that也可省略。whom在定语从句中作宾语， 先行词是人;this不能引导从句。故选A。
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