It is ten months
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It is ten months ____we last met.
选 D【since】.句意：我们有十个月没有见面了.
It was ten months ago ____we last met .
选 C 【when】.句意：我们最后一次见面是在十年前.
It will be ten months/was ten mothes _____we meet again/met again.选 A【before】.句意：我们要过十年过能再见面./ 过了十年我们才见面.
======以下答案可供参考======
供参考答案1:
since;when;before