SAT语法题目

Onine 3, 4
28The radio station received the largest number of calls from
listeners on the evening it aired a discussion of the music of Aretha Franklin.
为什么没有标点还对？

Online3,10
9My grandfather never learned to use a calculator, but as he shops he can accurately
compute his grocery bill in his head to within a dollar
这是一个正确的句子，为什么shops不用逗号？

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