He was much more thorough in his studies than the rest of his class and it was for this reason（）he made such great progress. 选项 A: why B: how C: that D: for

He was much more thorough in his studies than the rest of his class and it was for this reason（）he made such great progress.
选项
A: why
B: how
C: that
D: for

出自：综合英语

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