He was about to tell me the secret someone patted him on the shoulder. A. as B.
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He was about to tell methe secret ________ someone patted him on the shoulder.
| A. as | B. until | C. while | D. when |
试题答案
答案：D
提示：| 题目考察时间状语从句连接词when的基本意义之一at that time
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