问题描述：
Mr Smith ___ at this school since he ___ to Zhuhai.
A:has been taught; came B:has taught; has come
C:has been teaching; has come D:has been teaching; came
为什么选D?has been teaching是什么时态?
A:has been taught; came B:has taught; has come
C:has been teaching; has come D:has been teaching; came
为什么选D?has been teaching是什么时态?
问题解答：
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