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The first thing she did ( ) up to her teacher and thank her

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The first thing she did ( ) up to her teacher and thank her for all her help.A.to go B.had gone
C.was go D.was going
悬着那个,为神马?求详解
The first thing she did ( ) up to her teacher and thank her
C
这是“主系表” 结构,先排除没有系词的A, B
由于是将要做的是要用不定式作表语,排除D
选c . 主语部分有实义动词 do"做“ 这时表语是不定式时可以省to(当然也可以不省略)
全句意为: 他做的第一件事就是向他的老师走过去感谢他所有的帮助.