___mathematical concepts of some students was very difficult because the students did not have a mat

___mathematical concepts of some students was very difficult because the students did not have a mat

题目
___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
答案
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
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