在British defence policy had to meet three criteria if it was to succeed中为什么it was to 这里为什么要用 过去时

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在British defence policy had to meet three criteria if it was to succeed中为什么it was to 这里为什么要用 过去时
在British defence policy had to meet three criteria if it was to succeed中为什么
it was to 这里为什么要用 过去时

在British defence policy had to meet three criteria if it was to succeed中为什么it was to 这里为什么要用 过去时
前后一致 had to过去式,表示过去不得不 后面也需要用过去式