___mathematical concepts of some students was very difficult

___mathematical concepts of some students was very difficult because the students did not have a math background .
a Explain b explaining c have explained d having explained
追求梦想hhuseu 1年前 已收到1个回答 举报

daiyong520 幼苗

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因为做主语
所以A和C淘汰了
要是动名词才能作主语
我觉得选B吧
向学生解释数学的内容是很难得因为学生没有学习数学的背景.

1年前

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