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老师请问几个问题it was after the failure of this attempt that he res

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老师请问几个问题
it was after the failure of this attempt that he resorted to force.这里的that he resorted to force是真主语吧
has to do had to do和has had to do有什么区别
the shoulders and the back which is还是are caused by pressure and tension in work?谓语单复数是就近原则还是什么?如果是两个tom and me是用are吗?有什么规定的吗.
it was after the failure of this attempt that he resorted to force.这是对 状语 强调的 强调句型
= he resorted to force after the failure of this attempt
所以 里的that he resorted to force不是真主语
has to do had to do和has had to do的区别 是时态上的区别1 一般现在时2 一般过去时 3 现在完成时
the shoulders and the back which is还是are caused by pressure and tension in work
都对
前者 先行词 是 the back
后者先行词 是 the shoulders and the back
谓语单复数是 根据先行词 而定
可根据 句子意思 判断