问题
单项选择题
One morning my patience was growing thin during Mark talked once too often, and then I made a novice-teacher’s mistake.
A. when
B. as
C. while
D. whenever
答案
参考答案：A
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One morning my patience was growing thin during Mark talked once too often, and then I made a novice-teacher’s mistake.
A. when
B. as
C. while
D. whenever
参考答案：A
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