问题
选择题
| I had just stepped out of the bathroom and was busy drying myself with a towel _____I heard the steps. |
A. while B. when C. since D. after |
答案
答案：B
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| I had just stepped out of the bathroom and was busy drying myself with a towel _____I heard the steps. |
A. while B. when C. since D. after |
答案：B