上海华山医院代挂号:31. ___ several times,....

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31. ___ several times, but he still does not know how to use the cleaner.
a.Having been shown b.I have shown him 为什么用B不用A 请详细分析

b

1，这是两句独立的句子，因为有but .

2，如果想用a ，则要改成 Having 、、、，he still、、、、、。

B: 我已经给他看了许多次了....

31. ___ several times,.... 1,I’d met Jone several time before.___.Aso did I Bso had I CI did ,either. I regard ___ this job on time 32. ___ several times, but he still doesn't know how to use the cleaner. ___ several times, but he still doesn't know how to use the cleaner. 19 I must apologize for ___ ahead of time...... Is it time ___ home ? Here's a card___Zhangbing. Jack spent as much time as he ___ over lessons. She was determined to ___ there in time.完形 It's time ___ you to read the text