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He asked them to come to his office one _____.
A.at a timeB.at all timeC.at timesD.at one time
A

试题分析:考查词组:A. at a time一次B. at all time一直C. at times有时D. at one time曾经,句意:他叫他们一次一个去他的办公室。选A。
点评:解答这类题目,首先要理解题干的意思,其次要知道各选项词组的意思,然后像数学中的代入法一样,依次把各个选项意思放入句子中进行比较,不难选出正确答案。关键还是在平时学习的过程中,多积累多总结多记忆。以动词或者名词作为中心词进行记忆,是个不错的方法。
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