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Tell him to finish his work first, ___ he come this afternoo

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Tell him to finish his work first, ___ he come this afternoon.
A if B were C should D had
答案上给的是C 为什么? 我翻译不通 我觉得应该选A
Tell him to finish his work first, ___ he come this afternoo
答案是C没错.这里的should是affirmative action的作用,就是肯定行动,也是说将自己的意见表明.
注意以下句子的变化.
He should come this afternoon.
Should he come this afternoon?
What does he has to do should he come this afternoon?
He has to finish his work should he come this afternoon.
Tell him to finish his work should he come this afternoon.
这就可以告诉你为什么用should.
不能用IF因为come没有s.这是陷阱.
其实,还可以说:
Tell him to finish his work if he should come this afternoon.
其实英语语法结合起来是有很多不同的用法.复杂的句子不可能是以任何一个单词或语法解释的.必须考虑到全文意思.这跟中文是一样的.
这也是为什么网上翻译都那么失败,因为他们都用固定的语法来解释复杂的文章.