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when you are writing,you have to make sure that the words (

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when you are writing,you have to make sure that the words ( ) correctly.
A.are spelt B.were spelt C.will be spelt D.should be spelt
为什么,
when you are writing,you have to make sure that the words (
首先B不对,因为句子是一般现在时
C根据句意也不适用一般将来时,现在时即可
D句中已有make sure确保的意思了,所以就不用应该被.,若选D意思就变成应确保单词应该拼写正确,确保和应该重复
再问: 问题就是为什么是一般现在时