Is it the days you studied in our school have a great effect on your maths?A. that whereB

问题补充：

Is it the days you studied in our school have a great effect on your maths?

A. that, where

B. that, that

C. when, where

D. when , that

答案：

A. that, where

B. that, that

C. when, where

(答案→)D. when , that

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