你断错了，应该是这样分的：
The only way (to do this) was to operate.
同意一楼~to do this 用来修饰way的~~这句话的主干是“te way was to operate.”
The (only) way (to do this) was to operate
主干是： the way was to operate （the way是主语，主语不是this哦）
同意上面观点
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