A:is it three years since you met him last?B:__three years__since you met him last.t

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• 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.
• 9.Good to see you again.It”s almost three years___we met last time.A.until B.before C.while D.9.Good to see you again.It”s almost three years___we met last time.A.until B.before C.while D.since （我选D）要理由.
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• A:is it three years since you met him last?B:__three years__since you met him last.t同义句转换
• A:is it three years since you met him last?B:__three years__since you met him last.t
• 9.Good to see you again.It”s almost three years___we met last time.A.until B.before C.while D.
• 计算(a+b+c)(a²+b²+c²-ab-ac-bc)要过程 满意的追分
• 已知实数a，b，c满足a2+b2=1，b2+c2=2，c2+a2=2，则ab+bc+ca的最小值为（　　）A. 52B. 12+3C. −12D. 12−3