从句子的意思看是说：双休日额外的课程给了原来有很多作业的学生更多的压力.
所以第一个空肯定是more
piles of意思：成堆的；一大团；一大批
可以跟不可数名词,而many of后面只跟可数名词
所以是C
Extra lessons on Sundays put ()pressure on students ,who alr
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