It is the day October 1st 1949 the People’s Republic of China was founded we’ll never f

问题补充：

It is the day October 1st, 1949 the People’s Republic of China was founded we’ll never forget.

A. that; that

B. that; when

C. in which, that

D. when, that

答案：

A. that; that

B. that; when

C. in which, that

(答案→)D. when, that

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