That was so serious a matter that I had no choice
商务英语应用
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That was so serious a matter that I had no choice but ________ the police.
A) called in B) calling in
C) call in D) to call in
热搜:i型呼吸衰竭主要见于什么
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D
but前面有一个否定词no,就形成了一个固定句型not……but
这个句型的特点是,but前面没有do,那but后用to+动词原形
but前面有do,后面就没有to
记起来也很好记,有to就没do,有do就没to
