It's a one-week （ ）（强化）course in English.括号里填什么?不是training?

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It's a one-week （ ）（强化）course in English.括号里填什么?不是training?
It's a one-week （ ）（强化）course in English.
括号里填什么?不是training?

It's a one-week （ ）（强化）course in English.括号里填什么?不是training?
intensive

enforce 还是 strengthen

reinforcing