It was 2 months _____the young man mastered the skill of run

It was 2 months _____the young man mastered the skill of running the machine introduced from Korea.
1since 2 before
2对
翻译

板凳小子007 1年前已收到4个回答举报

jwjw1120 幼苗

共回答了18个问题采纳率：83.3% 举报

选2,before.因为第一按照语境句子所表达的意思,只能选before.它的意思是：两个月以前,这个年轻人掌握了一门从韩国引进的机器的操作技能.第二,since一般都要和完成时态连用,后面跟一个时间状语从句.

1年前

边缘观察幼苗

共回答了781个问题举报

应该before.
since与完成时对应，如果用since，应该it has been 2 months

1年前

tiange1fang 幼苗

共回答了12个问题举报

翻译：年轻人花了2个月掌握了从韩国引进的机器的操作技能。
是选2.before。选1的话就是用完成时态，而不是was

1年前

878795 幼苗

共回答了2个问题举报

since
因为since后面加过去时间点

1年前

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