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问题: 几道英语题

1.---Do you know our town at all?
---No,it's the first time I ____ here.
A.come B.have been
答案是B,不知道能用come或came吗?为什么?

2.看这句话:
By the time he reached the dentist, the pain in his tooth had stopped.
这句话表示在他到牙医那之前牙疼就停了。如果我想表达“他一到牙医那,牙疼就停了(有那么点碰巧的意思)”又该怎么表达呢?

解答:

it's the first time 后加现在完成时,happen to do 是恰巧,碰巧的意思