Question

Good to see you again. It's almost three years ___ we met last time.

A.until B.before C.while D.since 我选了B，可是答案选D，可是我觉的since用于现在完成时，since加过去时间点，可是我还是觉得选B，意思是很高兴再一次见到你，这是我上一次见到你之前几乎三年了。
希望你能帮我一下。

Answer 1

你好，
为你解答，

对于since的理解，你是正确的，它是多用于现在完成。但是它后面也可以跟句子，不一定就要跟时间点。
本题 It's almost three years since we met last time = It's been almost three years since we met las t time.

又如：It has been two years since he became a football player = He has been a football player since two years ago.

基本句型It is +一段时间＋since+一般过去时或现在完成时。
例如: It's twenty years since I've known her.我认识她已经二十年了。
How long is it since we last went to the theatre? 我们多久没去看戏了？

上面的知识点记住就行了。

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祝你学习进步，更上一层楼！

不明白请及时追问，满意敬请采纳，O(∩_∩)O谢谢

Answer 2

从含义上来说，如果before的话，就是在我们上次见面之前，几乎三年没见了，强调的是上次见面之前，而此句话想表达的是在现在之前我们有三年没见了，也就是上次见面之后我们有三年没见了，
从语法上来说：如果用before，前面也应该用完成时吧